400020400002 has 64 divisors (see below), whose sum is σ = 824726448000. Its totient is φ = 129267985920.

The previous prime is 400020399949. The next prime is 400020400049. The reversal of 400020400002 is 200004020004.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87933624 + ... + 87938172.

It is an arithmetic number, because the mean of its divisors is an integer number (12886350750).

Almost surely, 2^400020400002 is an apocalyptic number.

400020400002 is an abundant number, since it is smaller than the sum of its proper divisors (424706047998).

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

400020400002 is a wasteful number, since it uses less digits than its factorization.

400020400002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6771.

The product of its (nonzero) digits is 64, while the sum is 12.

Adding to 400020400002 its reverse (200004020004), we get a palindrome (600024420006).

The spelling of 400020400002 in words is "four hundred billion, twenty million, four hundred thousand, two".