138592997 has 4 divisors (see below), whose sum is σ = 141973356. Its totient is φ = 135212640.

The previous prime is 138592969. The next prime is 138593023. The reversal of 138592997 is 799295831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 799295831 = 3881 ⋅205951.

It can be written as a sum of positive squares in 2 ways, for example, as 20349121 + 118243876 = 4511^2 + 10874^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138592997 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 (138594997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1690118 + ... + 1690199.

It is an arithmetic number, because the mean of its divisors is an integer number (35493339).

Almost surely, 2^138592997 is an apocalyptic number.

It is an amenable number.

138592997 is a deficient number, since it is larger than the sum of its proper divisors (3380359).

138592997 is an equidigital number, since it uses as much as digits as its factorization.

138592997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3380358.

The product of its digits is 1224720, while the sum is 53.

The square root of 138592997 is about 11772.5526968453. The cubic root of 138592997 is about 517.5040608953.

The spelling of 138592997 in words is "one hundred thirty-eight million, five hundred ninety-two thousand, nine hundred ninety-seven".