18991252 has 24 divisors (see below), whose sum is σ = 38608640. Its totient is φ = 8004960.

The previous prime is 18991237. The next prime is 18991253. The reversal of 18991252 is 25219981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18991253) 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, 3852 + ... + 7267.

Almost surely, 2^18991252 is an apocalyptic number.

It is an amenable number.

18991252 is an abundant number, since it is smaller than the sum of its proper divisors (19617388).

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

18991252 is a wasteful number, since it uses less digits than its factorization.

18991252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11191 (or 11189 counting only the distinct ones).

The product of its digits is 12960, while the sum is 37.

The square root of 18991252 is about 4357.8953635901. The cubic root of 18991252 is about 266.7992056422.

The spelling of 18991252 in words is "eighteen million, nine hundred ninety-one thousand, two hundred fifty-two".