402785 has 4 divisors (see below), whose sum is σ = 483348. Its totient is φ = 322224.

The previous prime is 402769. The next prime is 402797. The reversal of 402785 is 587204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 187489 + 215296 = 433^2 + 464^2 .

It is a cyclic number.

It is not a de Polignac number, because 402785 - 2⁴ = 402769 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11 and base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40274 + ... + 40283.

It is an arithmetic number, because the mean of its divisors is an integer number (120837).

2⁴⁰²⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

402785 is a deficient number, since it is larger than the sum of its proper divisors (80563).

402785 is an equidigital number, since it uses as much as digits as its factorization.

402785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80562.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 402785 is about 634.6534487419. The cubic root of 402785 is about 73.8512350993.

Adding to 402785 its reverse (587204), we get a palindrome (989989).

The spelling of 402785 in words is "four hundred two thousand, seven hundred eighty-five".