257795139 has 8 divisors (see below), whose sum is σ = 392830720. Its totient is φ = 147311496.

The previous prime is 257795119. The next prime is 257795143. The reversal of 257795139 is 931597752.

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

It is not a de Polignac number, because 257795139 - 2⁷ = 257795011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257795119) 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, 6137959 + ... + 6138000.

It is an arithmetic number, because the mean of its divisors is an integer number (49103840).

Almost surely, 2^257795139 is an apocalyptic number.

257795139 is a deficient number, since it is larger than the sum of its proper divisors (135035581).

257795139 is a wasteful number, since it uses less digits than its factorization.

257795139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12275969.

The product of its digits is 595350, while the sum is 48.

The square root of 257795139 is about 16056.0000934230. Note that the first 4 decimals coincide. The cubic root of 257795139 is about 636.4411346612.

The spelling of 257795139 in words is "two hundred fifty-seven million, seven hundred ninety-five thousand, one hundred thirty-nine".