406520057 has 6 divisors (see below), whose sum is σ = 421022238. Its totient is φ = 392501312.

The previous prime is 406520053. The next prime is 406520069. The reversal of 406520057 is 750025604.

It can be written as a sum of positive squares in 3 ways, for example, as 9554281 + 396965776 = 3091^2 + 19924^2 .

It is not a de Polignac number, because 406520057 - 2² = 406520053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406520053) 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 5 ways as a sum of consecutive naturals, for example, 240848 + ... + 242529.

It is an arithmetic number, because the mean of its divisors is an integer number (70170373).

Almost surely, 2^406520057 is an apocalyptic number.

It is an amenable number.

406520057 is a deficient number, since it is larger than the sum of its proper divisors (14502181).

406520057 is an equidigital number, since it uses as much as digits as its factorization.

406520057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483435 (or 483406 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 406520057 is about 20162.3425474323. The cubic root of 406520057 is about 740.7880920944.

The spelling of 406520057 in words is "four hundred six million, five hundred twenty thousand, fifty-seven".