400244100 has 72 divisors (see below), whose sum is σ = 1195423488. Its totient is φ = 103286400.

The previous prime is 400244083. The next prime is 400244149. The reversal of 400244100 is 1442004.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 400244100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12219 + ... + 30818.

It is an arithmetic number, because the mean of its divisors is an integer number (16603104).

Almost surely, 2^400244100 is an apocalyptic number.

It is an amenable number.

400244100 is an abundant number, since it is smaller than the sum of its proper divisors (795179388).

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

400244100 is a wasteful number, since it uses less digits than its factorization.

400244100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43085 (or 43078 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 400244100 is about 20006.1015692713. The cubic root of 400244100 is about 736.9561479321.

Adding to 400244100 its reverse (1442004), we get a palindrome (401686104).

The spelling of 400244100 in words is "four hundred million, two hundred forty-four thousand, one hundred".