406387404 has 18 divisors (see below), whose sum is σ = 1027257140. Its totient is φ = 135462456.

The previous prime is 406387381. The next prime is 406387433. The reversal of 406387404 is 404783604.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 11288539 = 406387404 / (4 + 0 + 6 + 3 + 8 + 7 + 4 + 0 + 4).

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, 5644234 + ... + 5644305.

Almost surely, 2^406387404 is an apocalyptic number.

It is an amenable number.

406387404 is an abundant number, since it is smaller than the sum of its proper divisors (620869736).

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

406387404 is a wasteful number, since it uses less digits than its factorization.

406387404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11288549 (or 11288544 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The square root of 406387404 is about 20159.0526563130. The cubic root of 406387404 is about 740.7075069328.

The spelling of 406387404 in words is "four hundred six million, three hundred eighty-seven thousand, four hundred four".