402504040 has 64 divisors (see below), whose sum is σ = 921456000. Its totient is φ = 158216448.

The previous prime is 402504023. The next prime is 402504059. The reversal of 402504040 is 40405204.

It is a junction number, because it is equal to n+sod(n) for n = 402503999 and 402504017.

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 15 ways as a sum of consecutive naturals, for example, 671661 + ... + 672259.

It is an arithmetic number, because the mean of its divisors is an integer number (14397750).

Almost surely, 2^402504040 is an apocalyptic number.

402504040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402504040 is an abundant number, since it is smaller than the sum of its proper divisors (518951960).

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

402504040 is a wasteful number, since it uses less digits than its factorization.

402504040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874 (or 870 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 402504040 is about 20062.5033333331. The cubic root of 402504040 is about 738.3405962571.

Adding to 402504040 its reverse (40405204), we get a palindrome (442909244).

The spelling of 402504040 in words is "four hundred two million, five hundred four thousand, forty".