402420040 has 32 divisors (see below), whose sum is σ = 987759360. Its totient is φ = 146334400.

The previous prime is 402420013. The next prime is 402420059. The reversal of 402420040 is 40024204.

It is a junction number, because it is equal to n+sod(n) for n = 402419996 and 402420023.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 456856 + ... + 457735.

It is an arithmetic number, because the mean of its divisors is an integer number (30867480).

Almost surely, 2^402420040 is an apocalyptic number.

402420040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402420040 is an abundant number, since it is smaller than the sum of its proper divisors (585339320).

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

402420040 is a wasteful number, since it uses less digits than its factorization.

402420040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914613 (or 914609 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 402420040 is about 20060.4097665028. The cubic root of 402420040 is about 738.2892303752.

Adding to 402420040 its reverse (40024204), we get a palindrome (442444244).

The spelling of 402420040 in words is "four hundred two million, four hundred twenty thousand, forty".