138623287 has 12 divisors (see below), whose sum is σ = 161336448. Its totient is φ = 118606400.

The previous prime is 138623237. The next prime is 138623291. The reversal of 138623287 is 782326831.

It is not a de Polignac number, because 138623287 - 2¹¹ = 138621239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138623237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31639 + ... + 35752.

It is an arithmetic number, because the mean of its divisors is an integer number (13444704).

Almost surely, 2^138623287 is an apocalyptic number.

138623287 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

138623287 is a deficient number, since it is larger than the sum of its proper divisors (22713161).

138623287 is a wasteful number, since it uses less digits than its factorization.

138623287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67430 (or 67419 counting only the distinct ones).

The product of its digits is 96768, while the sum is 40.

The square root of 138623287 is about 11773.8390935158. The cubic root of 138623287 is about 517.5417589428.

The spelling of 138623287 in words is "one hundred thirty-eight million, six hundred twenty-three thousand, two hundred eighty-seven".