161858830 has 32 divisors (see below), whose sum is σ = 338618880. Its totient is φ = 54552480.

The previous prime is 161858821. The next prime is 161858867. The reversal of 161858830 is 38858161.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15466 + ... + 23725.

It is an arithmetic number, because the mean of its divisors is an integer number (10581840).

Almost surely, 2^161858830 is an apocalyptic number.

161858830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161858830 is an abundant number, since it is smaller than the sum of its proper divisors (176760050).

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

161858830 is a wasteful number, since it uses less digits than its factorization.

161858830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39264.

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 161858830 is about 12722.3751713271. The cubic root of 161858830 is about 544.9777843538.

The spelling of 161858830 in words is "one hundred sixty-one million, eight hundred fifty-eight thousand, eight hundred thirty".