402440213420 has 144 divisors (see below), whose sum is σ = 999789557760. Its totient is φ = 135648777600.

The previous prime is 402440213419. The next prime is 402440213459. The reversal of 402440213420 is 24312044204.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 402440213420.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24971165 + ... + 24987275.

It is an arithmetic number, because the mean of its divisors is an integer number (6942983040).

Almost surely, 2^402440213420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402440213420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (499894778880).

402440213420 is an abundant number, since it is smaller than the sum of its proper divisors (597349344340).

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

402440213420 is a wasteful number, since it uses less digits than its factorization.

402440213420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16564 (or 16555 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 402440213420 its reverse (24312044204), we get a palindrome (426752257624).

The spelling of 402440213420 in words is "four hundred two billion, four hundred forty million, two hundred thirteen thousand, four hundred twenty".