990208807 has 12 divisors (see below), whose sum is σ = 1212501720. Its totient is φ = 804078576.

The previous prime is 990208801. The next prime is 990208823. The reversal of 990208807 is 708802099.

990208807 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 990208807 - 2¹¹ = 990206759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990208801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 530868 + ... + 532729.

It is an arithmetic number, because the mean of its divisors is an integer number (101041810).

Almost surely, 2^990208807 is an apocalyptic number.

990208807 is a deficient number, since it is larger than the sum of its proper divisors (222292913).

990208807 is a wasteful number, since it uses less digits than its factorization.

990208807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063630 (or 1063623 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 990208807 is about 31467.5834312074. The cubic root of 990208807 is about 996.7255587372.

The spelling of 990208807 in words is "nine hundred ninety million, two hundred eight thousand, eight hundred seven".