257408419 has 4 divisors (see below), whose sum is σ = 258098896. Its totient is φ = 256717944.

The previous prime is 257408413. The next prime is 257408467. The reversal of 257408419 is 914804752.

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

It is a cyclic number.

It is not a de Polignac number, because 257408419 - 2¹¹ = 257406371 is a prime.

It is a super-2 number, since 2×257408419² = 132518188344159122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257408413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344679 + ... + 345424.

It is an arithmetic number, because the mean of its divisors is an integer number (64524724).

Almost surely, 2^257408419 is an apocalyptic number.

257408419 is a deficient number, since it is larger than the sum of its proper divisors (690477).

257408419 is an equidigital number, since it uses as much as digits as its factorization.

257408419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690476.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 257408419 is about 16043.9527236900. The cubic root of 257408419 is about 636.1227323694.

The spelling of 257408419 in words is "two hundred fifty-seven million, four hundred eight thousand, four hundred nineteen".