400204100 has 18 divisors (see below), whose sum is σ = 868443114. Its totient is φ = 160081600.

The previous prime is 400204081. The next prime is 400204109. The reversal of 400204100 is 1402004.

It can be written as a sum of positive squares in 3 ways, for example, as 6895876 + 393308224 = 2626^2 + 19832^2 .

It is not an unprimeable number, because it can be changed into a prime (400204109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2000921 + ... + 2001120.

Almost surely, 2^400204100 is an apocalyptic number.

It is an amenable number.

400204100 is an abundant number, since it is smaller than the sum of its proper divisors (468239014).

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

400204100 is a wasteful number, since it uses less digits than its factorization.

400204100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4002055 (or 4002048 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 400204100 is about 20005.1018492783. The cubic root of 400204100 is about 736.9315968910.

Adding to 400204100 its reverse (1402004), we get a palindrome (401606104).

The spelling of 400204100 in words is "four hundred million, two hundred four thousand, one hundred".