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171990 = 23357213
BaseRepresentation
bin101001111111010110
322201221000
4221333112
521000430
63404130
71314300
oct517726
9281830
10171990
11108245
1283646
1360390
1446970
1535e60
hex29fd6

171990 has 96 divisors (see below), whose sum is σ = 574560. Its totient is φ = 36288.

The previous prime is 171947. The next prime is 172001. The reversal of 171990 is 99171.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13224 + ... + 13236.

It is an arithmetic number, because the mean of its divisors is an integer number (5985).

2171990 is an apocalyptic number.

171990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 171990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287280).

171990 is an abundant number, since it is smaller than the sum of its proper divisors (402570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

171990 is a wasteful number, since it uses less digits than its factorization.

171990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43 (or 30 counting only the distinct ones).

The product of its (nonzero) digits is 567, while the sum is 27.

The square root of 171990 is about 414.7167708208. The cubic root of 171990 is about 55.6118998734.

The spelling of 171990 in words is "one hundred seventy-one thousand, nine hundred ninety".

Divisors: 1 2 3 5 6 7 9 10 13 14 15 18 21 26 27 30 35 39 42 45 49 54 63 65 70 78 90 91 98 105 117 126 130 135 147 182 189 195 210 234 245 270 273 294 315 351 378 390 441 455 490 546 585 630 637 702 735 819 882 910 945 1170 1274 1323 1365 1470 1638 1755 1890 1911 2205 2457 2646 2730 3185 3510 3822 4095 4410 4914 5733 6370 6615 8190 9555 11466 12285 13230 17199 19110 24570 28665 34398 57330 85995 171990