138023690427 has 24 divisors (see below), whose sum is σ = 231249364736. Its totient is φ = 77693503536.

The previous prime is 138023690381. The next prime is 138023690471. The reversal of 138023690427 is 724096320831.

138023690427 is a `hidden beast` number, since 138 + 0 + 2 + 3 + 6 + 90 + 427 = 666.

It is not a de Polignac number, because 138023690427 - 2⁸ = 138023690171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138023690477) 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, 16345423 + ... + 16353864.

Almost surely, 2^138023690427 is an apocalyptic number.

138023690427 is a deficient number, since it is larger than the sum of its proper divisors (93225674309).

138023690427 is a wasteful number, since it uses less digits than its factorization.

138023690427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32699367 (or 32699364 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 138023690427 in words is "one hundred thirty-eight billion, twenty-three million, six hundred ninety thousand, four hundred twenty-seven".