400022004 has 12 divisors (see below), whose sum is σ = 933384704. Its totient is φ = 133340664.

The previous prime is 400021987. The next prime is 400022017. The reversal of 400022004 is 400220004.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Harshad number since it is a multiple of its sum of digits (12), and also a Moran number because the ratio is a prime number: 33335167 = 400022004 / (4 + 0 + 0 + 0 + 2 + 2 + 0 + 0 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16667572 + ... + 16667595.

Almost surely, 2^400022004 is an apocalyptic number.

It is an amenable number.

400022004 is an abundant number, since it is smaller than the sum of its proper divisors (533362700).

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

400022004 is a wasteful number, since it uses less digits than its factorization.

400022004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33335174 (or 33335172 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 400022004 is about 20000.5500924350. The cubic root of 400022004 is about 736.8198100519.

Adding to 400022004 its reverse (400220004), we get a palindrome (800242008).

The spelling of 400022004 in words is "four hundred million, twenty-two thousand, four".