18538674 has 32 divisors (see below), whose sum is σ = 46227456. Its totient is φ = 4815120.

The previous prime is 18538643. The next prime is 18538679. The reversal of 18538674 is 47683581.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18538679) 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 15 ways as a sum of consecutive naturals, for example, 19602 + ... + 20525.

It is an arithmetic number, because the mean of its divisors is an integer number (1444608).

Almost surely, 2^18538674 is an apocalyptic number.

18538674 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18538674 is an abundant number, since it is smaller than the sum of its proper divisors (27688782).

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

18538674 is a wasteful number, since it uses less digits than its factorization.

18538674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40150.

The product of its digits is 161280, while the sum is 42.

The square root of 18538674 is about 4305.6560475728. The cubic root of 18538674 is about 264.6627916902.

The spelling of 18538674 in words is "eighteen million, five hundred thirty-eight thousand, six hundred seventy-four".