990105 has 16 divisors (see below), whose sum is σ = 1598400. Its totient is φ = 523328.

The previous prime is 990053. The next prime is 990137. The reversal of 990105 is 501099.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 990105 - 2⁷ = 989977 is a prime.

It is a super-2 number, since 2×990105² = 1960615822050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2014 + ... + 2456.

It is an arithmetic number, because the mean of its divisors is an integer number (99900).

2⁹⁹⁰¹⁰⁵ is an apocalyptic number.

It is an amenable number.

990105 is a deficient number, since it is larger than the sum of its proper divisors (608295).

990105 is a wasteful number, since it uses less digits than its factorization.

990105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600.

The product of its (nonzero) digits is 405, while the sum is 24.

The square root of 990105 is about 995.0402001929. The cubic root of 990105 is about 99.6690727462.

The spelling of 990105 in words is "nine hundred ninety thousand, one hundred five".