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189490 = 2572707
BaseRepresentation
bin101110010000110010
3100121221011
4232100302
522030430
64021134
71416310
oct562062
9317834
10189490
1111a404
12917aa
1368332
144d0b0
153b22a
hex2e432

189490 has 16 divisors (see below), whose sum is σ = 389952. Its totient is φ = 64944.

The previous prime is 189479. The next prime is 189491. The reversal of 189490 is 94981.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189491) by changing a digit.

189490 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1284 + ... + 1423.

It is an arithmetic number, because the mean of its divisors is an integer number (24372).

2189490 is an apocalyptic number.

189490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189490 is an abundant number, since it is smaller than the sum of its proper divisors (200462).

It is a weird number, because it is abundant, but not a pseudoperfect number.

189490 is a wasteful number, since it uses less digits than its factorization.

189490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2721.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 189490 is about 435.3044911324. The cubic root of 189490 is about 57.4374871975.

It can be divided in two parts, 18 and 9490, that multiplied together give a triangular number (170820 = T584).

The spelling of 189490 in words is "one hundred eighty-nine thousand, four hundred ninety".

Divisors: 1 2 5 7 10 14 35 70 2707 5414 13535 18949 27070 37898 94745 189490