18139674 has 64 divisors (see below), whose sum is σ = 43856640. Its totient is φ = 4892160.

The previous prime is 18139633. The next prime is 18139711. The reversal of 18139674 is 47693181.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64414 + ... + 64694.

It is an arithmetic number, because the mean of its divisors is an integer number (685260).

Almost surely, 2^18139674 is an apocalyptic number.

18139674 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18139674, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21928320).

18139674 is an abundant number, since it is smaller than the sum of its proper divisors (25716966).

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

18139674 is a wasteful number, since it uses less digits than its factorization.

18139674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375.

The product of its digits is 36288, while the sum is 39.

The square root of 18139674 is about 4259.0696167121. The cubic root of 18139674 is about 262.7502629152.

The spelling of 18139674 in words is "eighteen million, one hundred thirty-nine thousand, six hundred seventy-four".