991373924 has 24 divisors (see below), whose sum is σ = 1800804096. Its totient is φ = 477036000.

The previous prime is 991373897. The next prime is 991373927. The reversal of 991373924 is 429373199.

It is a happy number.

991373924 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (991373927) 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, 359 + ... + 44529.

It is an arithmetic number, because the mean of its divisors is an integer number (75033504).

Almost surely, 2^991373924 is an apocalyptic number.

It is an amenable number.

991373924 is a deficient number, since it is larger than the sum of its proper divisors (809430172).

991373924 is a wasteful number, since it uses less digits than its factorization.

991373924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44387 (or 44385 counting only the distinct ones).

The product of its digits is 367416, while the sum is 47.

The square root of 991373924 is about 31486.0909609307. The cubic root of 991373924 is about 997.1163337956.

The spelling of 991373924 in words is "nine hundred ninety-one million, three hundred seventy-three thousand, nine hundred twenty-four".