18699972 has 24 divisors (see below), whose sum is σ = 44233056. Its totient is φ = 6147648.

The previous prime is 18699953. The next prime is 18699973. The reversal of 18699972 is 27999681.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18699973) 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, 9798 + ... + 11549.

It is an arithmetic number, because the mean of its divisors is an integer number (1843044).

Almost surely, 2^18699972 is an apocalyptic number.

18699972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18699972 is an abundant number, since it is smaller than the sum of its proper divisors (25533084).

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

18699972 is a wasteful number, since it uses less digits than its factorization.

18699972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21427 (or 21425 counting only the distinct ones).

The product of its digits is 489888, while the sum is 51.

The square root of 18699972 is about 4324.3464246057. The cubic root of 18699972 is about 265.4281532499.

The spelling of 18699972 in words is "eighteen million, six hundred ninety-nine thousand, nine hundred seventy-two".