990990399 has 16 divisors (see below), whose sum is σ = 1511136000. Its totient is φ = 565884480.

The previous prime is 990990383. The next prime is 990990431. The reversal of 990990399 is 993099099.

990990399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 31480²-1.

It is not a de Polignac number, because 990990399 - 2⁴ = 990990383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990990799) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15739 + ... + 47219.

It is an arithmetic number, because the mean of its divisors is an integer number (94446000).

Almost surely, 2^990990399 is an apocalyptic number.

990990399 is a deficient number, since it is larger than the sum of its proper divisors (520145601).

990990399 is a wasteful number, since it uses less digits than its factorization.

990990399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32990.

The product of its (nonzero) digits is 1594323, while the sum is 57.

The square root of 990990399 is about 31479.9999841169. Note that the first 4 decimals coincide. The cubic root of 990990399 is about 996.9877350373.

The spelling of 990990399 in words is "nine hundred ninety million, nine hundred ninety thousand, three hundred ninety-nine".