138292887 has 16 divisors (see below), whose sum is σ = 194400000. Its totient is φ = 87205824.

The previous prime is 138292883. The next prime is 138292961. The reversal of 138292887 is 788292831.

It is not a de Polignac number, because 138292887 - 2² = 138292883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138292883) 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, 44614 + ... + 47612.

It is an arithmetic number, because the mean of its divisors is an integer number (12150000).

Almost surely, 2^138292887 is an apocalyptic number.

138292887 is a deficient number, since it is larger than the sum of its proper divisors (56107113).

138292887 is a wasteful number, since it uses less digits than its factorization.

138292887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3830.

The product of its digits is 387072, while the sum is 48.

The square root of 138292887 is about 11759.7996156397. The cubic root of 138292887 is about 517.1302556193.

The spelling of 138292887 in words is "one hundred thirty-eight million, two hundred ninety-two thousand, eight hundred eighty-seven".