909990 has 24 divisors (see below), whose sum is σ = 2366208. Its totient is φ = 242640.

The previous prime is 909977. The next prime is 910003. The reversal of 909990 is 99909.

It is an interprime number because it is at equal distance from previous prime (909977) and next prime (910003).

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 11 ways as a sum of consecutive naturals, for example, 4966 + ... + 5145.

It is an arithmetic number, because the mean of its divisors is an integer number (98592).

2⁹⁰⁹⁹⁹⁰ is an apocalyptic number.

909990 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

909990 is an abundant number, since it is smaller than the sum of its proper divisors (1456218).

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

909990 is a wasteful number, since it uses less digits than its factorization.

909990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10124 (or 10121 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 36.

The square root of 909990 is about 953.9339599784. The cubic root of 909990 is about 96.9048558689.

The spelling of 909990 in words is "nine hundred nine thousand, nine hundred ninety".