991380700 has 18 divisors (see below), whose sum is σ = 2151296336. Its totient is φ = 396552240.

The previous prime is 991380683. The next prime is 991380703. The reversal of 991380700 is 7083199.

It is a self number, because there is not a number n which added to its sum of digits gives 991380700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991380703) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4956804 + ... + 4957003.

Almost surely, 2^991380700 is an apocalyptic number.

It is an amenable number.

991380700 is an abundant number, since it is smaller than the sum of its proper divisors (1159915636).

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

991380700 is a wasteful number, since it uses less digits than its factorization.

991380700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9913821 (or 9913814 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 991380700 is about 31486.1985638152. The cubic root of 991380700 is about 997.1186055402.

The spelling of 991380700 in words is "nine hundred ninety-one million, three hundred eighty thousand, seven hundred".