405257 has 4 divisors (see below), whose sum is σ = 408576. Its totient is φ = 401940.

The previous prime is 405253. The next prime is 405269. The reversal of 405257 is 752504.

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 405257 - 2² = 405253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405253) 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, 1469 + ... + 1722.

It is an arithmetic number, because the mean of its divisors is an integer number (102144).

2⁴⁰⁵²⁵⁷ is an apocalyptic number.

It is an amenable number.

405257 is a deficient number, since it is larger than the sum of its proper divisors (3319).

405257 is a wasteful number, since it uses less digits than its factorization.

405257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3318.

The product of its (nonzero) digits is 1400, while the sum is 23.

The square root of 405257 is about 636.5979893151. The cubic root of 405257 is about 74.0020087110.

The spelling of 405257 in words is "four hundred five thousand, two hundred fifty-seven".