400244024020 has 12 divisors (see below), whose sum is σ = 840512450484. Its totient is φ = 160097609600.

The previous prime is 400244024017. The next prime is 400244024087. The reversal of 400244024020 is 20420442004.

It can be written as a sum of positive squares in 2 ways, for example, as 127179250884 + 273064773136 = 356622^2 + 522556^2 .

It is a junction number, because it is equal to n+sod(n) for n = 400244023982 and 400244024000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10006100581 + ... + 10006100620.

It is an arithmetic number, because the mean of its divisors is an integer number (70042704207).

Almost surely, 2^400244024020 is an apocalyptic number.

It is an amenable number.

400244024020 is an abundant number, since it is smaller than the sum of its proper divisors (440268426464).

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

400244024020 is a wasteful number, since it uses less digits than its factorization.

400244024020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20012201210 (or 20012201208 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 22.

Adding to 400244024020 its reverse (20420442004), we get a palindrome (420664466024).

The spelling of 400244024020 in words is "four hundred billion, two hundred forty-four million, twenty-four thousand, twenty".