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161690 = 25192337
BaseRepresentation
bin100111011110011010
322012210112
4213132122
520133230
63244322
71242254
oct473632
9265715
10161690
11100531
12796a2
1358799
1442cd4
1532d95
hex2779a

161690 has 32 divisors (see below), whose sum is σ = 328320. Its totient is φ = 57024.

The previous prime is 161683. The next prime is 161717. The reversal of 161690 is 96161.

161690 = T4 + T5 + ... + T98.

It is a super-2 number, since 2×1616902 = 52287312200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

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

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4352 + ... + 4388.

It is an arithmetic number, because the mean of its divisors is an integer number (10260).

2161690 is an apocalyptic number.

161690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161690 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

161690 is a wasteful number, since it uses less digits than its factorization.

161690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 161690 is about 402.1069509471. The cubic root of 161690 is about 54.4788235209.

The spelling of 161690 in words is "one hundred sixty-one thousand, six hundred ninety".

Divisors: 1 2 5 10 19 23 37 38 46 74 95 115 185 190 230 370 437 703 851 874 1406 1702 2185 3515 4255 4370 7030 8510 16169 32338 80845 161690