18981552 has 20 divisors (see below), whose sum is σ = 49035800. Its totient is φ = 6327168.

The previous prime is 18981511. The next prime is 18981559. The reversal of 18981552 is 25518981.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18981552.

It is not an unprimeable number, because it can be changed into a prime (18981559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197677 + ... + 197772.

It is an arithmetic number, because the mean of its divisors is an integer number (2451790).

Almost surely, 2^18981552 is an apocalyptic number.

18981552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18981552 is an abundant number, since it is smaller than the sum of its proper divisors (30054248).

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

18981552 is a wasteful number, since it uses less digits than its factorization.

18981552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395460 (or 395454 counting only the distinct ones).

The product of its digits is 28800, while the sum is 39.

The square root of 18981552 is about 4356.7822988990. The cubic root of 18981552 is about 266.7537743206.

The spelling of 18981552 in words is "eighteen million, nine hundred eighty-one thousand, five hundred fifty-two".