400090906 has 8 divisors (see below), whose sum is σ = 601837524. Its totient is φ = 199478400.

The previous prime is 400090861. The next prime is 400090909. The reversal of 400090906 is 609090004.

It can be written as a sum of positive squares in 2 ways, for example, as 398361681 + 1729225 = 19959^2 + 1315^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (400090909) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 282645 + ... + 284056.

Almost surely, 2^400090906 is an apocalyptic number.

400090906 is a deficient number, since it is larger than the sum of its proper divisors (201746618).

400090906 is a wasteful number, since it uses less digits than its factorization.

400090906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567056.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 400090906 is about 20002.2725208912. The cubic root of 400090906 is about 736.8621122614.

The spelling of 400090906 in words is "four hundred million, ninety thousand, nine hundred six".