138031387 has 16 divisors (see below), whose sum is σ = 155232000. Its totient is φ = 121855104.

The previous prime is 138031363. The next prime is 138031403. The reversal of 138031387 is 783130831.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138031387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138031357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39414 + ... + 42772.

It is an arithmetic number, because the mean of its divisors is an integer number (9702000).

Almost surely, 2^138031387 is an apocalyptic number.

138031387 is a deficient number, since it is larger than the sum of its proper divisors (17200613).

138031387 is a wasteful number, since it uses less digits than its factorization.

138031387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3510.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 138031387 is about 11748.6759679549. The cubic root of 138031387 is about 516.8041002875.

The spelling of 138031387 in words is "one hundred thirty-eight million, thirty-one thousand, three hundred eighty-seven".