138659597 has 4 divisors (see below), whose sum is σ = 140217660. Its totient is φ = 137101536.

The previous prime is 138659593. The next prime is 138659603. The reversal of 138659597 is 795956831.

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

It can be written as a sum of positive squares in 2 ways, for example, as 65060356 + 73599241 = 8066^2 + 8579^2 .

It is a cyclic number.

It is not a de Polignac number, because 138659597 - 2² = 138659593 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 (138659593) 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, 778898 + ... + 779075.

It is an arithmetic number, because the mean of its divisors is an integer number (35054415).

Almost surely, 2^138659597 is an apocalyptic number.

It is an amenable number.

138659597 is a deficient number, since it is larger than the sum of its proper divisors (1558063).

138659597 is an equidigital number, since it uses as much as digits as its factorization.

138659597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558062.

The product of its digits is 2041200, while the sum is 53.

The square root of 138659597 is about 11775.3809704824. The cubic root of 138659597 is about 517.5869420699.

The spelling of 138659597 in words is "one hundred thirty-eight million, six hundred fifty-nine thousand, five hundred ninety-seven".