138847457 has 4 divisors (see below), whose sum is σ = 158682816. Its totient is φ = 119012100.

The previous prime is 138847451. The next prime is 138847487. The reversal of 138847457 is 754748831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138847457 - 2⁸ = 138847201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138847451) 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, 9917669 + ... + 9917682.

It is an arithmetic number, because the mean of its divisors is an integer number (39670704).

Almost surely, 2^138847457 is an apocalyptic number.

It is an amenable number.

138847457 is a deficient number, since it is larger than the sum of its proper divisors (19835359).

138847457 is an equidigital number, since it uses as much as digits as its factorization.

138847457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19835358.

The product of its digits is 752640, while the sum is 47.

The square root of 138847457 is about 11783.3550824882. The cubic root of 138847457 is about 517.8205837995.

The spelling of 138847457 in words is "one hundred thirty-eight million, eight hundred forty-seven thousand, four hundred fifty-seven".