990750 has 32 divisors (see below), whose sum is σ = 2474784. Its totient is φ = 264000.

The previous prime is 990733. The next prime is 990761. The reversal of 990750 is 57099.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

990750 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90 + ... + 1410.

It is an arithmetic number, because the mean of its divisors is an integer number (77337).

2⁹⁹⁰⁷⁵⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1237392).

990750 is an abundant number, since it is smaller than the sum of its proper divisors (1484034).

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

990750 is a wasteful number, since it uses less digits than its factorization.

990750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341 (or 1331 counting only the distinct ones).

The product of its (nonzero) digits is 2835, while the sum is 30.

The square root of 990750 is about 995.3642549338. The cubic root of 990750 is about 99.6907110564.

The spelling of 990750 in words is "nine hundred ninety thousand, seven hundred fifty".