9990456 has 32 divisors (see below), whose sum is σ = 28544640. Its totient is φ = 2854368.

The previous prime is 9990403. The next prime is 9990457. The reversal of 9990456 is 6540999.

It is a happy number.

It is a super-2 number, since 2×9990456² = 199618422175872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990457) 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, 29566 + ... + 29901.

It is an arithmetic number, because the mean of its divisors is an integer number (892020).

Almost surely, 2^9990456 is an apocalyptic number.

It is an amenable number.

9990456 is an abundant number, since it is smaller than the sum of its proper divisors (18554184).

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

9990456 is a wasteful number, since it uses less digits than its factorization.

9990456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59483 (or 59479 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 9990456 is about 3160.7682610403. The cubic root of 9990456 is about 215.3749074379.

The spelling of 9990456 in words is "nine million, nine hundred ninety thousand, four hundred fifty-six".