138690652 has 72 divisors (see below), whose sum is σ = 277347840. Its totient is φ = 60419520.

The previous prime is 138690647. The next prime is 138690653. The reversal of 138690652 is 256096831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138690653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3225343 + ... + 3225385.

Almost surely, 2^138690652 is an apocalyptic number.

It is an amenable number.

138690652 is a deficient number, since it is larger than the sum of its proper divisors (138657188).

138690652 is a wasteful number, since it uses less digits than its factorization.

138690652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 138690652 is about 11776.6995376464. The cubic root of 138690652 is about 517.6255797673.

The spelling of 138690652 in words is "one hundred thirty-eight million, six hundred ninety thousand, six hundred fifty-two".