161583930 has 64 divisors (see below), whose sum is σ = 437011200. Its totient is φ = 42477120.

The previous prime is 161583881. The next prime is 161583943. The reversal of 161583930 is 39385161.

It is a happy number.

161583930 is a `hidden beast` number, since 1 + 615 + 8 + 3 + 9 + 30 = 666.

It is a super-2 number, since 2×161583930² = 52218732868489800, which contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 14956 + ... + 23384.

It is an arithmetic number, because the mean of its divisors is an integer number (6828300).

Almost surely, 2^161583930 is an apocalyptic number.

161583930 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 161583930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218505600).

161583930 is an abundant number, since it is smaller than the sum of its proper divisors (275427270).

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

161583930 is a wasteful number, since it uses less digits than its factorization.

161583930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8516 (or 8510 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 161583930 is about 12711.5667799056. The cubic root of 161583930 is about 544.6690805950.

The spelling of 161583930 in words is "one hundred sixty-one million, five hundred eighty-three thousand, nine hundred thirty".