400320402100 has 18 divisors (see below), whose sum is σ = 868695272774. Its totient is φ = 160128160800.

The previous prime is 400320402059. The next prime is 400320402137. The reversal of 400320402100 is 1204023004.

It can be written as a sum of positive squares in 3 ways, for example, as 1858989456 + 398461412644 = 43116^2 + 631238^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2001601911 + ... + 2001602110.

Almost surely, 2^400320402100 is an apocalyptic number.

It is an amenable number.

400320402100 is an abundant number, since it is smaller than the sum of its proper divisors (468374870674).

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

400320402100 is a wasteful number, since it uses less digits than its factorization.

400320402100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4003204035 (or 4003204028 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 400320402100 its reverse (1204023004), we get a palindrome (401524425104).

The spelling of 400320402100 in words is "four hundred billion, three hundred twenty million, four hundred two thousand, one hundred".