263401257 has 8 divisors (see below), whose sum is σ = 401373376. Its totient is φ = 150514992.

The previous prime is 263401253. The next prime is 263401279. The reversal of 263401257 is 752104362.

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

It is not a de Polignac number, because 263401257 - 2² = 263401253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263401253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6271438 + ... + 6271479.

It is an arithmetic number, because the mean of its divisors is an integer number (50171672).

Almost surely, 2^263401257 is an apocalyptic number.

It is an amenable number.

263401257 is a deficient number, since it is larger than the sum of its proper divisors (137972119).

263401257 is a wasteful number, since it uses less digits than its factorization.

263401257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12542927.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 263401257 is about 16229.6413084208. The cubic root of 263401257 is about 641.0215270024.

The spelling of 263401257 in words is "two hundred sixty-three million, four hundred one thousand, two hundred fifty-seven".