990259793 has 4 divisors (see below), whose sum is σ = 999023268. Its totient is φ = 981496320.

The previous prime is 990259789. The next prime is 990259801. The reversal of 990259793 is 397952099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 397952099 = 17 ⋅23408947.

It can be written as a sum of positive squares in 2 ways, for example, as 32171584 + 958088209 = 5672^2 + 30953^2 .

It is a cyclic number.

It is not a de Polignac number, because 990259793 - 2² = 990259789 is a prime.

It is a super-2 number, since 2×990259793² = 1961228915264805698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990259783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4381568 + ... + 4381793.

It is an arithmetic number, because the mean of its divisors is an integer number (249755817).

Almost surely, 2^990259793 is an apocalyptic number.

It is an amenable number.

990259793 is a deficient number, since it is larger than the sum of its proper divisors (8763475).

990259793 is a wasteful number, since it uses less digits than its factorization.

990259793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8763474.

The product of its (nonzero) digits is 1377810, while the sum is 53.

The square root of 990259793 is about 31468.3935560746. The cubic root of 990259793 is about 996.7426656265.

The spelling of 990259793 in words is "nine hundred ninety million, two hundred fifty-nine thousand, seven hundred ninety-three".