138207087 has 32 divisors (see below), whose sum is σ = 210528000. Its totient is φ = 89575200.

The previous prime is 138207077. The next prime is 138207101. The reversal of 138207087 is 780702831.

It is not a de Polignac number, because 138207087 - 2⁴ = 138207071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138207067) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160464 + ... + 161322.

It is an arithmetic number, because the mean of its divisors is an integer number (6579000).

Almost surely, 2^138207087 is an apocalyptic number.

138207087 is a deficient number, since it is larger than the sum of its proper divisors (72320913).

138207087 is a wasteful number, since it uses less digits than its factorization.

138207087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028 (or 1022 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 138207087 is about 11756.1510282915. The cubic root of 138207087 is about 517.0232871023.

The spelling of 138207087 in words is "one hundred thirty-eight million, two hundred seven thousand, eighty-seven".