9991974 has 16 divisors (see below), whose sum is σ = 20090880. Its totient is φ = 3312840.

The previous prime is 9991973. The next prime is 9991997. The reversal of 9991974 is 4791999.

9991974 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 not an unprimeable number, because it can be changed into a prime (9991973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3214 + ... + 5505.

It is an arithmetic number, because the mean of its divisors is an integer number (1255680).

Almost surely, 2^9991974 is an apocalyptic number.

9991974 is an abundant number, since it is smaller than the sum of its proper divisors (10098906).

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

9991974 is a wasteful number, since it uses less digits than its factorization.

9991974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8915.

The product of its digits is 183708, while the sum is 48.

The square root of 9991974 is about 3161.0083834119. The cubic root of 9991974 is about 215.3858152667.

The spelling of 9991974 in words is "nine million, nine hundred ninety-one thousand, nine hundred seventy-four".