9990426 has 8 divisors (see below), whose sum is σ = 19980864. Its totient is φ = 3330140.

The previous prime is 9990403. The next prime is 9990457. The reversal of 9990426 is 6240999.

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

9990426 is an admirable number.

It is a super-2 number, since 2×9990426² = 199617223322952, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 832530 + ... + 832541.

It is an arithmetic number, because the mean of its divisors is an integer number (2497608).

Almost surely, 2^9990426 is an apocalyptic number.

9990426 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.

9990426 is a wasteful number, since it uses less digits than its factorization.

9990426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665076.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 9990426 is about 3160.7635153551. The cubic root of 9990426 is about 215.3746918570.

It can be divided in two parts, 99 and 90426, that added together give a triangular number (90525 = T₄₂₅).

The spelling of 9990426 in words is "nine million, nine hundred ninety thousand, four hundred twenty-six".