138942550 has 12 divisors (see below), whose sum is σ = 258433236. Its totient is φ = 55577000.

The previous prime is 138942541. The next prime is 138942577. The reversal of 138942550 is 55249831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1389376 + ... + 1389475.

It is an arithmetic number, because the mean of its divisors is an integer number (21536103).

Almost surely, 2^138942550 is an apocalyptic number.

138942550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138942550 is a deficient number, since it is larger than the sum of its proper divisors (119490686).

138942550 is a wasteful number, since it uses less digits than its factorization.

138942550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2778863 (or 2778858 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 138942550 is about 11787.3894480500. The cubic root of 138942550 is about 517.9387707576.

The spelling of 138942550 in words is "one hundred thirty-eight million, nine hundred forty-two thousand, five hundred fifty".