161738190 has 48 divisors (see below), whose sum is σ = 421621200. Its totient is φ = 43017216.

The previous prime is 161738177. The next prime is 161738207. The reversal of 161738190 is 91837161.

161738190 is a `hidden beast` number, since 1 + 617 + 38 + 1 + 9 + 0 = 666.

It is a super-2 number, since 2×161738190² = 52318484208952200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35566 + ... + 39854.

It is an arithmetic number, because the mean of its divisors is an integer number (8783775).

Almost surely, 2^161738190 is an apocalyptic number.

161738190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161738190 is an abundant number, since it is smaller than the sum of its proper divisors (259883010).

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

161738190 is a wasteful number, since it uses less digits than its factorization.

161738190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4721 (or 4718 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 161738190 is about 12717.6330344919. The cubic root of 161738190 is about 544.8423526300.

The spelling of 161738190 in words is "one hundred sixty-one million, seven hundred thirty-eight thousand, one hundred ninety".