138317457 has 16 divisors (see below), whose sum is σ = 195996672. Its totient is φ = 86465280.

The previous prime is 138317453. The next prime is 138317483. The reversal of 138317457 is 754713831.

It is not a de Polignac number, because 138317457 - 2² = 138317453 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138317453) 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, 9232 + ... + 19022.

It is an arithmetic number, because the mean of its divisors is an integer number (12249792).

Almost surely, 2^138317457 is an apocalyptic number.

138317457 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

138317457 is a deficient number, since it is larger than the sum of its proper divisors (57679215).

138317457 is a wasteful number, since it uses less digits than its factorization.

138317457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10088.

The product of its digits is 70560, while the sum is 39.

The square root of 138317457 is about 11760.8442299012. The cubic root of 138317457 is about 517.1608793635.

The spelling of 138317457 in words is "one hundred thirty-eight million, three hundred seventeen thousand, four hundred fifty-seven".