18388434 has 32 divisors (see below), whose sum is σ = 37914624. Its totient is φ = 5942160.

The previous prime is 18388429. The next prime is 18388453. The reversal of 18388434 is 43488381.

It is a junction number, because it is equal to n+sod(n) for n = 18388392 and 18388401.

It is an unprimeable number.

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, 67719 + ... + 67989.

It is an arithmetic number, because the mean of its divisors is an integer number (1184832).

Almost surely, 2^18388434 is an apocalyptic number.

18388434 is an abundant number, since it is smaller than the sum of its proper divisors (19526190).

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

18388434 is a wasteful number, since it uses less digits than its factorization.

18388434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582.

The product of its digits is 73728, while the sum is 39.

The square root of 18388434 is about 4288.1737371520. The cubic root of 18388434 is about 263.9458968561.

The spelling of 18388434 in words is "eighteen million, three hundred eighty-eight thousand, four hundred thirty-four".