138875787 has 12 divisors (see below), whose sum is σ = 203424624. Its totient is φ = 91279440.

The previous prime is 138875777. The next prime is 138875797. The reversal of 138875787 is 787578831.

It is an interprime number because it is at equal distance from previous prime (138875777) and next prime (138875797).

It is not a de Polignac number, because 138875787 - 2²³ = 130487179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138875717) 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, 108028 + ... + 109305.

It is an arithmetic number, because the mean of its divisors is an integer number (16952052).

Almost surely, 2^138875787 is an apocalyptic number.

138875787 is a deficient number, since it is larger than the sum of its proper divisors (64548837).

138875787 is a wasteful number, since it uses less digits than its factorization.

138875787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217410 (or 217407 counting only the distinct ones).

The product of its digits is 2634240, while the sum is 54.

The square root of 138875787 is about 11784.5571405972. The cubic root of 138875787 is about 517.8557995675.

The spelling of 138875787 in words is "one hundred thirty-eight million, eight hundred seventy-five thousand, seven hundred eighty-seven".