402440420424 has 32 divisors (see below), whose sum is σ = 1149829773120. Its totient is φ = 114982977216.

The previous prime is 402440420399. The next prime is 402440420461. The reversal of 402440420424 is 424024044204.

It is a junction number, because it is equal to n+sod(n) for n = 402440420391 and 402440420400.

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, 1197739179 + ... + 1197739514.

It is an arithmetic number, because the mean of its divisors is an integer number (35932180410).

Almost surely, 2^402440420424 is an apocalyptic number.

It is an amenable number.

402440420424 is an abundant number, since it is smaller than the sum of its proper divisors (747389352696).

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

402440420424 is a wasteful number, since it uses less digits than its factorization.

402440420424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2395478709 (or 2395478705 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 30.

Adding to 402440420424 its reverse (424024044204), we get a palindrome (826464464628).

The spelling of 402440420424 in words is "four hundred two billion, four hundred forty million, four hundred twenty thousand, four hundred twenty-four".