400440204 has 36 divisors (see below), whose sum is σ = 1014784680. Its totient is φ = 133142400.

The previous prime is 400440203. The next prime is 400440217. The reversal of 400440204 is 402044004.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (400440203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 567 + ... + 28305.

Almost surely, 2^400440204 is an apocalyptic number.

It is an amenable number.

400440204 is an abundant number, since it is smaller than the sum of its proper divisors (614344476).

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

400440204 is a wasteful number, since it uses less digits than its factorization.

400440204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28150 (or 28145 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 400440204 is about 20011.0020738593. The cubic root of 400440204 is about 737.0764882042.

Adding to 400440204 its reverse (402044004), we get a palindrome (802484208).

The spelling of 400440204 in words is "four hundred million, four hundred forty thousand, two hundred four".