400252024520 has 32 divisors (see below), whose sum is σ = 900609694200. Its totient is φ = 160093229568.

The previous prime is 400252024519. The next prime is 400252024537. The reversal of 400252024520 is 25420252004.

It can be written as a sum of positive squares in 4 ways, for example, as 394682984644 + 5569039876 = 628238^2 + 74626^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 400252024520.

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, 660476 + ... + 1112084.

Almost surely, 2^400252024520 is an apocalyptic number.

400252024520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400252024520 is an abundant number, since it is smaller than the sum of its proper divisors (500357669680).

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

400252024520 is a wasteful number, since it uses less digits than its factorization.

400252024520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473777 (or 473773 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 26.

Adding to 400252024520 its reverse (25420252004), we get a palindrome (425672276524).

The spelling of 400252024520 in words is "four hundred billion, two hundred fifty-two million, twenty-four thousand, five hundred twenty".