405057 has 4 divisors (see below), whose sum is σ = 540080. Its totient is φ = 270036.

The previous prime is 405049. The next prime is 405071. The reversal of 405057 is 750504.

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 405057 - 2³ = 405049 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 405057.

It is not an unprimeable number, because it can be changed into a prime (405037) 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, 67507 + ... + 67512.

It is an arithmetic number, because the mean of its divisors is an integer number (135020).

2⁴⁰⁵⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

405057 is a deficient number, since it is larger than the sum of its proper divisors (135023).

405057 is a wasteful number, since it uses less digits than its factorization.

405057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135022.

The product of its (nonzero) digits is 700, while the sum is 21.

The square root of 405057 is about 636.4408849218. The cubic root of 405057 is about 73.9898330322.

The spelling of 405057 in words is "four hundred five thousand, fifty-seven".