406105257 has 4 divisors (see below), whose sum is σ = 541473680. Its totient is φ = 270736836.

The previous prime is 406105247. The next prime is 406105261. The reversal of 406105257 is 752501604.

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 not a de Polignac number, because 406105257 - 2²⁰ = 405056681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406105237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67684207 + ... + 67684212.

It is an arithmetic number, because the mean of its divisors is an integer number (135368420).

Almost surely, 2^406105257 is an apocalyptic number.

It is an amenable number.

406105257 is a deficient number, since it is larger than the sum of its proper divisors (135368423).

406105257 is a wasteful number, since it uses less digits than its factorization.

406105257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135368422.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 406105257 is about 20152.0534189447. The cubic root of 406105257 is about 740.5360475625.

The spelling of 406105257 in words is "four hundred six million, one hundred five thousand, two hundred fifty-seven".