16623972 has 36 divisors (see below), whose sum is σ = 43002960. Its totient is φ = 5411952.

The previous prime is 16623961. The next prime is 16624001. The reversal of 16623972 is 27932661.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3822 + ... + 6917.

Almost surely, 2^16623972 is an apocalyptic number.

16623972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16623972 is an abundant number, since it is smaller than the sum of its proper divisors (26378988).

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

16623972 is a wasteful number, since it uses less digits than its factorization.

16623972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10792 (or 10787 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 16623972 is about 4077.2505441780. The cubic root of 16623972 is about 255.2181754464.

The spelling of 16623972 in words is "sixteen million, six hundred twenty-three thousand, nine hundred seventy-two".