400900090 has 16 divisors (see below), whose sum is σ = 722172672. Its totient is φ = 160237264.

The previous prime is 400900081. The next prime is 400900099. The reversal of 400900090 is 90009004.

It is an interprime number because it is at equal distance from previous prime (400900081) and next prime (400900099).

It is not an unprimeable number, because it can be changed into a prime (400900099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 994 + ... + 28333.

It is an arithmetic number, because the mean of its divisors is an integer number (45135792).

Almost surely, 2^400900090 is an apocalyptic number.

400900090 is a deficient number, since it is larger than the sum of its proper divisors (321272582).

400900090 is a wasteful number, since it uses less digits than its factorization.

400900090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30701.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 400900090 is about 20022.4896054412. The cubic root of 400900090 is about 737.3585456944.

Adding to 400900090 its reverse (90009004), we get a palindrome (490909094).

The spelling of 400900090 in words is "four hundred million, nine hundred thousand, ninety".