18139934 has 4 divisors (see below), whose sum is σ = 27209904. Its totient is φ = 9069966.

The previous prime is 18139931. The next prime is 18139943. The reversal of 18139934 is 43993181.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18139931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4534982 + ... + 4534985.

It is an arithmetic number, because the mean of its divisors is an integer number (6802476).

Almost surely, 2^18139934 is an apocalyptic number.

18139934 is a deficient number, since it is larger than the sum of its proper divisors (9069970).

18139934 is an equidigital number, since it uses as much as digits as its factorization.

18139934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9069969.

The product of its digits is 23328, while the sum is 38.

The square root of 18139934 is about 4259.1001397009. The cubic root of 18139934 is about 262.7515182619.

The spelling of 18139934 in words is "eighteen million, one hundred thirty-nine thousand, nine hundred thirty-four".