402257 has 4 divisors (see below), whose sum is σ = 403620. Its totient is φ = 400896.

The previous prime is 402253. The next prime is 402263. The reversal of 402257 is 752204.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 22801 + 379456 = 151^2 + 616^2 .

It is a cyclic number.

It is not a de Polignac number, because 402257 - 2² = 402253 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 402257.

It is not an unprimeable number, because it can be changed into a prime (402253) 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, 32 + ... + 897.

It is an arithmetic number, because the mean of its divisors is an integer number (100905).

2⁴⁰²²⁵⁷ is an apocalyptic number.

It is an amenable number.

402257 is a deficient number, since it is larger than the sum of its proper divisors (1363).

402257 is an equidigital number, since it uses as much as digits as its factorization.

402257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362.

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 402257 is about 634.2373372800. The cubic root of 402257 is about 73.8189511239.

The spelling of 402257 in words is "four hundred two thousand, two hundred fifty-seven".