257940491 has 8 divisors (see below), whose sum is σ = 267899904. Its totient is φ = 248083560.

The previous prime is 257940437. The next prime is 257940497. The reversal of 257940491 is 194049752.

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 257940491 - 2¹⁰ = 257939467 is a prime.

It is a super-4 number, since 4×257940491⁴ (a number of 35 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257940497) 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, 20471 + ... + 30576.

It is an arithmetic number, because the mean of its divisors is an integer number (33487488).

Almost surely, 2^257940491 is an apocalyptic number.

257940491 is a deficient number, since it is larger than the sum of its proper divisors (9959413).

257940491 is a wasteful number, since it uses less digits than its factorization.

257940491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51241.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 257940491 is about 16060.5258631217. The cubic root of 257940491 is about 636.5607265348.

The spelling of 257940491 in words is "two hundred fifty-seven million, nine hundred forty thousand, four hundred ninety-one".