138891559 has 16 divisors (see below), whose sum is σ = 145595520. Its totient is φ = 132387840.

The previous prime is 138891521. The next prime is 138891569. The reversal of 138891559 is 955198831.

It is a cyclic number.

It is not a de Polignac number, because 138891559 - 2¹⁵ = 138858791 is a prime.

It is a super-2 number, since 2×138891559² = 38581730322900962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138891509) 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, 443587 + ... + 443899.

It is an arithmetic number, because the mean of its divisors is an integer number (9099720).

Almost surely, 2^138891559 is an apocalyptic number.

138891559 is a deficient number, since it is larger than the sum of its proper divisors (6703961).

138891559 is a wasteful number, since it uses less digits than its factorization.

138891559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570.

The product of its digits is 388800, while the sum is 49.

The square root of 138891559 is about 11785.2263024517. The cubic root of 138891559 is about 517.8754029668.

The spelling of 138891559 in words is "one hundred thirty-eight million, eight hundred ninety-one thousand, five hundred fifty-nine".