257240417 has 4 divisors (see below), whose sum is σ = 293989056. Its totient is φ = 220491780.

The previous prime is 257240407. The next prime is 257240453. The reversal of 257240417 is 714042752.

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 257240417 - 2²² = 253046113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257240407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18374309 + ... + 18374322.

It is an arithmetic number, because the mean of its divisors is an integer number (73497264).

Almost surely, 2^257240417 is an apocalyptic number.

It is an amenable number.

257240417 is a deficient number, since it is larger than the sum of its proper divisors (36748639).

257240417 is an equidigital number, since it uses as much as digits as its factorization.

257240417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36748638.

The product of its (nonzero) digits is 15680, while the sum is 32.

The square root of 257240417 is about 16038.7161892715. The cubic root of 257240417 is about 635.9843101294.

The spelling of 257240417 in words is "two hundred fifty-seven million, two hundred forty thousand, four hundred seventeen".