400444020424 has 32 divisors (see below), whose sum is σ = 867735849600. Its totient is φ = 169690561920.

The previous prime is 400444020401. The next prime is 400444020437. The reversal of 400444020424 is 424020444004.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 400444020392 and 400444020401.

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, 40167972 + ... + 40177939.

It is an arithmetic number, because the mean of its divisors is an integer number (27116745300).

Almost surely, 2^400444020424 is an apocalyptic number.

It is an amenable number.

400444020424 is an abundant number, since it is smaller than the sum of its proper divisors (467291829176).

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

400444020424 is a wasteful number, since it uses less digits than its factorization.

400444020424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80346013 (or 80346009 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 28.

Adding to 400444020424 its reverse (424020444004), we get a palindrome (824464464428).

The spelling of 400444020424 in words is "four hundred billion, four hundred forty-four million, twenty thousand, four hundred twenty-four".