16815972 has 24 divisors (see below), whose sum is σ = 39312000. Its totient is φ = 5594656.

The previous prime is 16815971. The next prime is 16815973. The reversal of 16815972 is 27951861.

It is an interprime number because it is at equal distance from previous prime (16815971) and next prime (16815973).

It is a self number, because there is not a number n which added to its sum of digits gives 16815972.

It is not an unprimeable number, because it can be changed into a prime (16815971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7654 + ... + 9602.

It is an arithmetic number, because the mean of its divisors is an integer number (1638000).

Almost surely, 2^16815972 is an apocalyptic number.

16815972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16815972 is an abundant number, since it is smaller than the sum of its proper divisors (22496028).

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

16815972 is a wasteful number, since it uses less digits than its factorization.

16815972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2675 (or 2673 counting only the distinct ones).

The product of its digits is 30240, while the sum is 39.

The square root of 16815972 is about 4100.7282280102. The cubic root of 16815972 is about 256.1969716168.

The spelling of 16815972 in words is "sixteen million, eight hundred fifteen thousand, nine hundred seventy-two".