138609275 has 24 divisors (see below), whose sum is σ = 206772480. Its totient is φ = 90041760.

The previous prime is 138609239. The next prime is 138609283. The reversal of 138609275 is 572906831.

It is not a de Polignac number, because 138609275 - 2²⁴ = 121832059 is a prime.

It is a super-2 number, since 2×138609275² = 38425062232051250, which contains 22 as substring.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 17519 + ... + 24168.

It is an arithmetic number, because the mean of its divisors is an integer number (8615520).

Almost surely, 2^138609275 is an apocalyptic number.

138609275 is a deficient number, since it is larger than the sum of its proper divisors (68163205).

138609275 is a wasteful number, since it uses less digits than its factorization.

138609275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41723 (or 41718 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 138609275 is about 11773.2440304276. The cubic root of 138609275 is about 517.5243207004.

The spelling of 138609275 in words is "one hundred thirty-eight million, six hundred nine thousand, two hundred seventy-five".