138291659 has 4 divisors (see below), whose sum is σ = 150863640. Its totient is φ = 125719680.

The previous prime is 138291653. The next prime is 138291661. The reversal of 138291659 is 956192831.

It is a happy number.

138291659 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138291659 - 2²⁰ = 137243083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138291653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6285974 + ... + 6285995.

It is an arithmetic number, because the mean of its divisors is an integer number (37715910).

Almost surely, 2^138291659 is an apocalyptic number.

138291659 is a deficient number, since it is larger than the sum of its proper divisors (12571981).

138291659 is a wasteful number, since it uses less digits than its factorization.

138291659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12571980.

The product of its digits is 116640, while the sum is 44.

The square root of 138291659 is about 11759.7474037498. The cubic root of 138291659 is about 517.1287249601.

The spelling of 138291659 in words is "one hundred thirty-eight million, two hundred ninety-one thousand, six hundred fifty-nine".