138974540 has 12 divisors (see below), whose sum is σ = 291846576. Its totient is φ = 55589808.

The previous prime is 138974527. The next prime is 138974551. The reversal of 138974540 is 45479831.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3474344 + ... + 3474383.

It is an arithmetic number, because the mean of its divisors is an integer number (24320548).

Almost surely, 2^138974540 is an apocalyptic number.

138974540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138974540 is an abundant number, since it is smaller than the sum of its proper divisors (152872036).

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

138974540 is a wasteful number, since it uses less digits than its factorization.

138974540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6948736 (or 6948734 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 138974540 is about 11788.7463285966. The cubic root of 138974540 is about 517.9785176166.

The spelling of 138974540 in words is "one hundred thirty-eight million, nine hundred seventy-four thousand, five hundred forty".