16161972 has 12 divisors (see below), whose sum is σ = 37711296. Its totient is φ = 5387320.

The previous prime is 16161953. The next prime is 16161991. The reversal of 16161972 is 27916161.

It is an interprime number because it is at equal distance from previous prime (16161953) and next prime (16161991).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×16161972² = 522418677857568, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 673404 + ... + 673427.

It is an arithmetic number, because the mean of its divisors is an integer number (3142608).

Almost surely, 2^16161972 is an apocalyptic number.

16161972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16161972 is an abundant number, since it is smaller than the sum of its proper divisors (21549324).

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

16161972 is a wasteful number, since it uses less digits than its factorization.

16161972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346838 (or 1346836 counting only the distinct ones).

The product of its digits is 4536, while the sum is 33.

The square root of 16161972 is about 4020.1955176334. The cubic root of 16161972 is about 252.8316564601.

The spelling of 16161972 in words is "sixteen million, one hundred sixty-one thousand, nine hundred seventy-two".