16165988 has 18 divisors (see below), whose sum is σ = 28638246. Its totient is φ = 7984768.

The previous prime is 16165969. The next prime is 16165991. The reversal of 16165988 is 88956161.

It can be written as a sum of positive squares in only one way, i.e., 13235044 + 2930944 = 3638^2 + 1712^2 .

It is a super-2 number, since 2×16165988² = 522678336032288, 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 (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45620 + ... + 45972.

Almost surely, 2^16165988 is an apocalyptic number.

It is an amenable number.

16165988 is a deficient number, since it is larger than the sum of its proper divisors (12472258).

16165988 is a wasteful number, since it uses less digits than its factorization.

16165988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571 (or 462 counting only the distinct ones).

The product of its digits is 103680, while the sum is 44.

The square root of 16165988 is about 4020.6949648040. The cubic root of 16165988 is about 252.8525963108.

The spelling of 16165988 in words is "sixteen million, one hundred sixty-five thousand, nine hundred eighty-eight".