990860 has 48 divisors (see below), whose sum is σ = 2323776. Its totient is φ = 352512.

The previous prime is 990851. The next prime is 990881. The reversal of 990860 is 68099.

It is a happy 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 15 ways as a sum of consecutive naturals, for example, 9569 + ... + 9671.

It is an arithmetic number, because the mean of its divisors is an integer number (48412).

2⁹⁹⁰⁸⁶⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1161888).

990860 is an abundant number, since it is smaller than the sum of its proper divisors (1332916).

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

990860 is a wasteful number, since it uses less digits than its factorization.

990860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 990860 is about 995.4195095536. The cubic root of 990860 is about 99.6944003734.

Subtracting from 990860 its reverse (68099), we obtain a triangular number (922761 = T₁₃₅₈).

The spelling of 990860 in words is "nine hundred ninety thousand, eight hundred sixty".