406039857 has 4 divisors (see below), whose sum is σ = 541386480. Its totient is φ = 270693236.

The previous prime is 406039847. The next prime is 406039867. The reversal of 406039857 is 758930604.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (406039847) and next prime (406039867).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-406039857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (406039847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67673307 + ... + 67673312.

It is an arithmetic number, because the mean of its divisors is an integer number (135346620).

Almost surely, 2^406039857 is an apocalyptic number.

It is an amenable number.

406039857 is a deficient number, since it is larger than the sum of its proper divisors (135346623).

406039857 is a wasteful number, since it uses less digits than its factorization.

406039857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135346622.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 406039857 is about 20150.4306901863. The cubic root of 406039857 is about 740.4962929613.

The spelling of 406039857 in words is "four hundred six million, thirty-nine thousand, eight hundred fifty-seven".