9918403990 has 32 divisors (see below), whose sum is σ = 19509444864. Its totient is φ = 3600524640.

The previous prime is 9918403981. The next prime is 9918404017. The reversal of 9918403990 is 993048199.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12234 + ... + 141373.

It is an arithmetic number, because the mean of its divisors is an integer number (609670152).

Almost surely, 2^9918403990 is an apocalyptic number.

9918403990 is a deficient number, since it is larger than the sum of its proper divisors (9591040874).

9918403990 is a wasteful number, since it uses less digits than its factorization.

9918403990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154212.

The product of its (nonzero) digits is 629856, while the sum is 52.

The square root of 9918403990 is about 99591.1842986115. The cubic root of 9918403990 is about 2148.5589037607.

The spelling of 9918403990 in words is "nine billion, nine hundred eighteen million, four hundred three thousand, nine hundred ninety".