18871072 has 24 divisors (see below), whose sum is σ = 40530672. Its totient is φ = 8577600.

The previous prime is 18871067. The next prime is 18871079. The reversal of 18871072 is 27017881.

It is a super-2 number, since 2×18871072² = 712234716858368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18871079) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 26454 + ... + 27157.

It is an arithmetic number, because the mean of its divisors is an integer number (1688778).

Almost surely, 2^18871072 is an apocalyptic number.

It is an amenable number.

18871072 is an abundant number, since it is smaller than the sum of its proper divisors (21659600).

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

18871072 is a wasteful number, since it uses less digits than its factorization.

18871072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53632 (or 53624 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 34.

The square root of 18871072 is about 4344.0847137228. The cubic root of 18871072 is about 266.2352301387.

The spelling of 18871072 in words is "eighteen million, eight hundred seventy-one thousand, seventy-two".