9990402 has 8 divisors (see below), whose sum is σ = 19980816. Its totient is φ = 3330132.

The previous prime is 9990389. The next prime is 9990403. The reversal of 9990402 is 2040999.

It is a happy number.

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

9990402 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (9990403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 832528 + ... + 832539.

It is an arithmetic number, because the mean of its divisors is an integer number (2497602).

Almost surely, 2^9990402 is an apocalyptic number.

9990402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

9990402 is a wasteful number, since it uses less digits than its factorization.

9990402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665072.

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

The square root of 9990402 is about 3160.7597188018. The cubic root of 9990402 is about 215.3745193920.

The spelling of 9990402 in words is "nine million, nine hundred ninety thousand, four hundred two".