991400704 has 144 divisors (see below), whose sum is σ = 2354688000. Its totient is φ = 407826432.

The previous prime is 991400651. The next prime is 991400723. The reversal of 991400704 is 407004199.

It is a self number, because there is not a number n which added to its sum of digits gives 991400704.

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 15 ways as a sum of consecutive naturals, for example, 6653622 + ... + 6653770.

It is an arithmetic number, because the mean of its divisors is an integer number (16352000).

Almost surely, 2^991400704 is an apocalyptic number.

991400704 is a gapful number since it is divisible by the number (94) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991400704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1177344000).

991400704 is an abundant number, since it is smaller than the sum of its proper divisors (1363287296).

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

991400704 is a wasteful number, since it uses less digits than its factorization.

991400704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 991400704 is about 31486.5162252034. The cubic root of 991400704 is about 997.1253120881.

The spelling of 991400704 in words is "nine hundred ninety-one million, four hundred thousand, seven hundred four".