138757427 has 4 divisors (see below), whose sum is σ = 139816776. Its totient is φ = 137698080.

The previous prime is 138757403. The next prime is 138757441. The reversal of 138757427 is 724757831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138757427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138757477) 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, 529478 + ... + 529739.

It is an arithmetic number, because the mean of its divisors is an integer number (34954194).

Almost surely, 2^138757427 is an apocalyptic number.

138757427 is a deficient number, since it is larger than the sum of its proper divisors (1059349).

138757427 is a wasteful number, since it uses less digits than its factorization.

138757427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059348.

The product of its digits is 329280, while the sum is 44.

The square root of 138757427 is about 11779.5342437636. The cubic root of 138757427 is about 517.7086396848.

The spelling of 138757427 in words is "one hundred thirty-eight million, seven hundred fifty-seven thousand, four hundred twenty-seven".