402540404 has 24 divisors (see below), whose sum is σ = 805764288. Its totient is φ = 172370880.

The previous prime is 402540317. The next prime is 402540431. The reversal of 402540404 is 404045204.

It is a self number, because there is not a number n which added to its sum of digits gives 402540404.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31547 + ... + 42429.

It is an arithmetic number, because the mean of its divisors is an integer number (33573512).

Almost surely, 2^402540404 is an apocalyptic number.

It is an amenable number.

402540404 is an abundant number, since it is smaller than the sum of its proper divisors (403223884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402540404 is a wasteful number, since it uses less digits than its factorization.

402540404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12215 (or 12213 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 23.

The square root of 402540404 is about 20063.4095806271. The cubic root of 402540404 is about 738.3628305755.

Adding to 402540404 its reverse (404045204), we get a palindrome (806585608).

The spelling of 402540404 in words is "four hundred two million, five hundred forty thousand, four hundred four".