138610945 has 24 divisors (see below), whose sum is σ = 193597992. Its totient is φ = 94871040.

The previous prime is 138610937. The next prime is 138610961. The reversal of 138610945 is 549016831.

It can be written as a sum of positive squares in 4 ways, for example, as 39727809 + 98883136 = 6303^2 + 9944^2 .

It is not a de Polignac number, because 138610945 - 2³ = 138610937 is a prime.

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

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3547 + ... + 17023.

It is an arithmetic number, because the mean of its divisors is an integer number (8066583).

Almost surely, 2^138610945 is an apocalyptic number.

It is an amenable number.

138610945 is a deficient number, since it is larger than the sum of its proper divisors (54987047).

138610945 is a wasteful number, since it uses less digits than its factorization.

138610945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13521 (or 13510 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 138610945 is about 11773.3149537418. The cubic root of 138610945 is about 517.5263991138.

The spelling of 138610945 in words is "one hundred thirty-eight million, six hundred ten thousand, nine hundred forty-five".