138774257 has 8 divisors (see below), whose sum is σ = 142430400. Its totient is φ = 135165520.

The previous prime is 138774227. The next prime is 138774263. The reversal of 138774257 is 752477831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138774257 - 2⁸ = 138774001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138774227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5882 + ... + 17667.

It is an arithmetic number, because the mean of its divisors is an integer number (17803800).

Almost surely, 2^138774257 is an apocalyptic number.

It is an amenable number.

138774257 is a deficient number, since it is larger than the sum of its proper divisors (3656143).

138774257 is an equidigital number, since it uses as much as digits as its factorization.

138774257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23703.

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

The square root of 138774257 is about 11780.2485966978. The cubic root of 138774257 is about 517.7295699378.

The spelling of 138774257 in words is "one hundred thirty-eight million, seven hundred seventy-four thousand, two hundred fifty-seven".