9991992 has 16 divisors (see below), whose sum is σ = 24980040. Its totient is φ = 3330656.

The previous prime is 9991973. The next prime is 9991997. The reversal of 9991992 is 2991999.

9991992 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208143 + ... + 208190.

Almost surely, 2^9991992 is an apocalyptic number.

It is an amenable number.

9991992 is an abundant number, since it is smaller than the sum of its proper divisors (14988048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9991992 is a wasteful number, since it uses less digits than its factorization.

9991992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416342 (or 416338 counting only the distinct ones).

The product of its digits is 118098, while the sum is 48.

The square root of 9991992 is about 3161.0112306033. The cubic root of 9991992 is about 215.3859446019.

The spelling of 9991992 in words is "nine million, nine hundred ninety-one thousand, nine hundred ninety-two".