991964392 has 32 divisors (see below), whose sum is σ = 1880512200. Its totient is φ = 490522624.

The previous prime is 991964387. The next prime is 991964411. The reversal of 991964392 is 293469199.

It can be written as a sum of positive squares in 4 ways, for example, as 961868196 + 30096196 = 31014^2 + 5486^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 319584 + ... + 322672.

Almost surely, 2^991964392 is an apocalyptic number.

It is an amenable number.

991964392 is a deficient number, since it is larger than the sum of its proper divisors (888547808).

991964392 is a wasteful number, since it uses less digits than its factorization.

991964392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3525 (or 3521 counting only the distinct ones).

The product of its digits is 944784, while the sum is 52.

The square root of 991964392 is about 31495.4662134092. The cubic root of 991964392 is about 997.3142572435.

The spelling of 991964392 in words is "nine hundred ninety-one million, nine hundred sixty-four thousand, three hundred ninety-two".