991658396 has 6 divisors (see below), whose sum is σ = 1735402200. Its totient is φ = 495829196.

The previous prime is 991658383. The next prime is 991658407. The reversal of 991658396 is 693856199.

991658396 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123957296 + ... + 123957303.

It is an arithmetic number, because the mean of its divisors is an integer number (289233700).

Almost surely, 2^991658396 is an apocalyptic number.

It is an amenable number.

991658396 is a deficient number, since it is larger than the sum of its proper divisors (743743804).

991658396 is a wasteful number, since it uses less digits than its factorization.

991658396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247914603 (or 247914601 counting only the distinct ones).

The product of its digits is 3149280, while the sum is 56.

The square root of 991658396 is about 31490.6080601820. The cubic root of 991658396 is about 997.2116979309.

The spelling of 991658396 in words is "nine hundred ninety-one million, six hundred fifty-eight thousand, three hundred ninety-six".