18139960 has 32 divisors (see below), whose sum is σ = 42134400. Its totient is φ = 7021440.

The previous prime is 18139951. The next prime is 18139967. The reversal of 18139960 is 6993181.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18139967) 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 7 ways as a sum of consecutive naturals, for example, 6075 + ... + 8554.

It is an arithmetic number, because the mean of its divisors is an integer number (1316700).

Almost surely, 2^18139960 is an apocalyptic number.

18139960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18139960 is an abundant number, since it is smaller than the sum of its proper divisors (23994440).

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

18139960 is a wasteful number, since it uses less digits than its factorization.

18139960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14671 (or 14667 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 18139960 is about 4259.1031919877. The cubic root of 18139960 is about 262.7516437959.

The spelling of 18139960 in words is "eighteen million, one hundred thirty-nine thousand, nine hundred sixty".