138844457 has 16 divisors (see below), whose sum is σ = 155275200. Its totient is φ = 123379200.

The previous prime is 138844451. The next prime is 138844477. The reversal of 138844457 is 754448831.

It is not a de Polignac number, because 138844457 - 2⁸ = 138844201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138844451) 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 15 ways as a sum of consecutive naturals, for example, 131582 + ... + 132632.

It is an arithmetic number, because the mean of its divisors is an integer number (9704700).

Almost surely, 2^138844457 is an apocalyptic number.

138844457 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

138844457 is a deficient number, since it is larger than the sum of its proper divisors (16430743).

138844457 is a wasteful number, since it uses less digits than its factorization.

138844457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1496.

The product of its digits is 430080, while the sum is 44.

The square root of 138844457 is about 11783.2277835914. The cubic root of 138844457 is about 517.8168543519.

The spelling of 138844457 in words is "one hundred thirty-eight million, eight hundred forty-four thousand, four hundred fifty-seven".