402511685 has 12 divisors (see below), whose sum is σ = 488529804. Its totient is φ = 318339840.

The previous prime is 402511663. The next prime is 402511699. The reversal of 402511685 is 586115204.

It can be written as a sum of positive squares in 2 ways, for example, as 162664516 + 239847169 = 12754^2 + 15487^2 .

It is not a de Polignac number, because 402511685 - 2⁶ = 402511621 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 441380 + ... + 442290.

It is an arithmetic number, because the mean of its divisors is an integer number (40710817).

Almost surely, 2^402511685 is an apocalyptic number.

It is an amenable number.

402511685 is a deficient number, since it is larger than the sum of its proper divisors (86018119).

402511685 is an frugal number, since it uses more digits than its factorization.

402511685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924 (or 1013 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 402511685 is about 20062.6938619917. The cubic root of 402511685 is about 738.3452708091.

Adding to 402511685 its reverse (586115204), we get a palindrome (988626889).

The spelling of 402511685 in words is "four hundred two million, five hundred eleven thousand, six hundred eighty-five".