16811972 has 6 divisors (see below), whose sum is σ = 29420958. Its totient is φ = 8405984.

The previous prime is 16811959. The next prime is 16811987. The reversal of 16811972 is 27911861.

It can be written as a sum of positive squares in only one way, i.e., 14868736 + 1943236 = 3856^2 + 1394^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2101493 + ... + 2101500.

It is an arithmetic number, because the mean of its divisors is an integer number (4903493).

Almost surely, 2^16811972 is an apocalyptic number.

It is an amenable number.

16811972 is a deficient number, since it is larger than the sum of its proper divisors (12608986).

16811972 is a wasteful number, since it uses less digits than its factorization.

16811972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4202997 (or 4202995 counting only the distinct ones).

The product of its digits is 6048, while the sum is 35.

The square root of 16811972 is about 4100.2404807523. The cubic root of 16811972 is about 256.1766562255.

The spelling of 16811972 in words is "sixteen million, eight hundred eleven thousand, nine hundred seventy-two".