18389434 has 16 divisors (see below), whose sum is σ = 31603968. Its totient is φ = 7861392.

The previous prime is 18389401. The next prime is 18389453. The reversal of 18389434 is 43498381.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5064 + ... + 7900.

It is an arithmetic number, because the mean of its divisors is an integer number (1975248).

Almost surely, 2^18389434 is an apocalyptic number.

18389434 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18389434 is a deficient number, since it is larger than the sum of its proper divisors (13214534).

18389434 is a wasteful number, since it uses less digits than its factorization.

18389434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3309.

The product of its digits is 82944, while the sum is 40.

The square root of 18389434 is about 4288.2903353201. The cubic root of 18389434 is about 263.9506814055.

The spelling of 18389434 in words is "eighteen million, three hundred eighty-nine thousand, four hundred thirty-four".