990738 has 32 divisors (see below), whose sum is σ = 2517120. Its totient is φ = 282960.

The previous prime is 990733. The next prime is 990761. The reversal of 990738 is 837099.

990738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 990738.

It is not an unprimeable number, because it can be changed into a prime (990733) by changing a digit.

990738 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, 933 + ... + 1688.

It is an arithmetic number, because the mean of its divisors is an integer number (78660).

2⁹⁹⁰⁷³⁸ is an apocalyptic number.

990738 is an abundant number, since it is smaller than the sum of its proper divisors (1526382).

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

990738 is a wasteful number, since it uses less digits than its factorization.

990738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2639 (or 2633 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 990738 is about 995.3582269716. The cubic root of 990738 is about 99.6903085689.

It can be divided in two parts, 990 and 738, that added together give a cube (1728 = 12³).

The spelling of 990738 in words is "nine hundred ninety thousand, seven hundred thirty-eight".