138826587 has 16 divisors (see below), whose sum is σ = 194319360. Its totient is φ = 88044000.

The previous prime is 138826549. The next prime is 138826591. The reversal of 138826587 is 785628831.

It is not a de Polignac number, because 138826587 - 2¹⁵ = 138793819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138826687) 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 15 ways as a sum of consecutive naturals, for example, 7164 + ... + 18137.

It is an arithmetic number, because the mean of its divisors is an integer number (12144960).

Almost surely, 2^138826587 is an apocalyptic number.

138826587 is a deficient number, since it is larger than the sum of its proper divisors (55492773).

138826587 is a wasteful number, since it uses less digits than its factorization.

138826587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25394.

The product of its digits is 645120, while the sum is 48.

The square root of 138826587 is about 11782.4694779999. The cubic root of 138826587 is about 517.7946381627.

The spelling of 138826587 in words is "one hundred thirty-eight million, eight hundred twenty-six thousand, five hundred eighty-seven".