138961275 has 12 divisors (see below), whose sum is σ = 229749432. Its totient is φ = 74112640.

The previous prime is 138961261. The next prime is 138961279. The reversal of 138961275 is 572169831.

It is not a de Polignac number, because 138961275 - 2¹⁰ = 138960251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138961279) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 926334 + ... + 926483.

It is an arithmetic number, because the mean of its divisors is an integer number (19145786).

Almost surely, 2^138961275 is an apocalyptic number.

138961275 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138961275 is a deficient number, since it is larger than the sum of its proper divisors (90788157).

138961275 is a wasteful number, since it uses less digits than its factorization.

138961275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852830 (or 1852825 counting only the distinct ones).

The product of its digits is 90720, while the sum is 42.

The square root of 138961275 is about 11788.1837023351. The cubic root of 138961275 is about 517.9620368913.

The spelling of 138961275 in words is "one hundred thirty-eight million, nine hundred sixty-one thousand, two hundred seventy-five".