18793872 has 30 divisors (see below), whose sum is σ = 52597142. Its totient is φ = 6264576.

The previous prime is 18793813. The next prime is 18793877. The reversal of 18793872 is 27839781.

Added to its reverse (27839781) it gives a triangular number (46633653 = T₉₆₅₇).

It can be written as a sum of positive squares in only one way, i.e., 17438976 + 1354896 = 4176^2 + 1164^2 .

It is not an unprimeable number, because it can be changed into a prime (18793877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 65113 + ... + 65400.

Almost surely, 2^18793872 is an apocalyptic number.

18793872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18793872 is an abundant number, since it is smaller than the sum of its proper divisors (33803270).

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

18793872 is a wasteful number, since it uses less digits than its factorization.

18793872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130527 (or 130518 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 18793872 is about 4335.1899612358. The cubic root of 18793872 is about 265.8716851493.

Adding to 18793872 its reverse (27839781), we get a triangular number (46633653 = T₉₆₅₇).

The spelling of 18793872 in words is "eighteen million, seven hundred ninety-three thousand, eight hundred seventy-two".