19864872 has 32 divisors (see below), whose sum is σ = 55180800. Its totient is φ = 6621552.

The previous prime is 19864837. The next prime is 19864903. The reversal of 19864872 is 27846891.

It is a super-2 number, since 2×19864872² = 789226279152768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45768 + ... + 46199.

It is an arithmetic number, because the mean of its divisors is an integer number (1724400).

Almost surely, 2^19864872 is an apocalyptic number.

19864872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19864872 is an abundant number, since it is smaller than the sum of its proper divisors (35315928).

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

19864872 is a wasteful number, since it uses less digits than its factorization.

19864872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91982 (or 91972 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 19864872 is about 4457.0025802102. The cubic root of 19864872 is about 270.8290566478.

It can be divided in two parts, 19864 and 872, that added together give a 4-th power (20736 = 12⁴).

The spelling of 19864872 in words is "nineteen million, eight hundred sixty-four thousand, eight hundred seventy-two".