9990542 has 8 divisors (see below), whose sum is σ = 15774600. Its totient is φ = 4732344.

The previous prime is 9990499. The next prime is 9990551. The reversal of 9990542 is 2450999.

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

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 262909 = 9990542 / (9 + 9 + 9 + 0 + 5 + 4 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 9990496 and 9990505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131417 + ... + 131492.

It is an arithmetic number, because the mean of its divisors is an integer number (1971825).

Almost surely, 2^9990542 is an apocalyptic number.

9990542 is a deficient number, since it is larger than the sum of its proper divisors (5784058).

9990542 is a wasteful number, since it uses less digits than its factorization.

9990542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262930.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 9990542 is about 3160.7818652985. The cubic root of 9990542 is about 215.3755254340.

The spelling of 9990542 in words is "nine million, nine hundred ninety thousand, five hundred forty-two".