909090402 has 64 divisors (see below), whose sum is σ = 2122049664. Its totient is φ = 256573440.

The previous prime is 909090401. The next prime is 909090421. The reversal of 909090402 is 204090909.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (909090401) 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 31 ways as a sum of consecutive naturals, for example, 104658 + ... + 113010.

It is an arithmetic number, because the mean of its divisors is an integer number (33157026).

Almost surely, 2^909090402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 909090402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1061024832).

909090402 is an abundant number, since it is smaller than the sum of its proper divisors (1212959262).

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

909090402 is a wasteful number, since it uses less digits than its factorization.

909090402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8483.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 909090402 is about 30151.1260486238. The cubic root of 909090402 is about 968.7291260324.

The spelling of 909090402 in words is "nine hundred nine million, ninety thousand, four hundred two".