990997869 has 16 divisors (see below), whose sum is σ = 1349478144. Its totient is φ = 646651200.

The previous prime is 990997841. The next prime is 990997901. The reversal of 990997869 is 968799099.

It is not a de Polignac number, because 990997869 - 2⁵ = 990997837 is a prime.

It is a super-2 number, since 2×990997869² = 1964153552725082322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990997169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61299 + ... + 75759.

It is an arithmetic number, because the mean of its divisors is an integer number (84342384).

Almost surely, 2^990997869 is an apocalyptic number.

It is an amenable number.

990997869 is a deficient number, since it is larger than the sum of its proper divisors (358480275).

990997869 is a wasteful number, since it uses less digits than its factorization.

990997869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14948.

The product of its (nonzero) digits is 19840464, while the sum is 66.

The square root of 990997869 is about 31480.1186306532. The cubic root of 990997869 is about 996.9902401001.

The spelling of 990997869 in words is "nine hundred ninety million, nine hundred ninety-seven thousand, eight hundred sixty-nine".