138402387 has 12 divisors (see below), whose sum is σ = 202161960. Its totient is φ = 91231008.

The previous prime is 138402371. The next prime is 138402401. The reversal of 138402387 is 783204831.

It is not a de Polignac number, because 138402387 - 2⁴ = 138402371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138402307) 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, 85593 + ... + 87194.

It is an arithmetic number, because the mean of its divisors is an integer number (16846830).

Almost surely, 2^138402387 is an apocalyptic number.

138402387 is a deficient number, since it is larger than the sum of its proper divisors (63759573).

138402387 is a wasteful number, since it uses less digits than its factorization.

138402387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172882 (or 172879 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 138402387 is about 11764.4543859883. The cubic root of 138402387 is about 517.2667071400.

The spelling of 138402387 in words is "one hundred thirty-eight million, four hundred two thousand, three hundred eighty-seven".