478121257 has 4 divisors (see below), whose sum is σ = 489240400. Its totient is φ = 467002116.

The previous prime is 478121249. The next prime is 478121299. The reversal of 478121257 is 752121874.

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 478121257 - 2³ = 478121249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478121207) 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 3 ways as a sum of consecutive naturals, for example, 5559507 + ... + 5559592.

It is an arithmetic number, because the mean of its divisors is an integer number (122310100).

Almost surely, 2^478121257 is an apocalyptic number.

It is an amenable number.

478121257 is a deficient number, since it is larger than the sum of its proper divisors (11119143).

478121257 is a wasteful number, since it uses less digits than its factorization.

478121257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11119142.

The product of its digits is 31360, while the sum is 37.

The square root of 478121257 is about 21865.9840162751. The cubic root of 478121257 is about 781.9506605841.

The spelling of 478121257 in words is "four hundred seventy-eight million, one hundred twenty-one thousand, two hundred fifty-seven".