991983946 has 8 divisors (see below), whose sum is σ = 1501882560. Its totient is φ = 491356428.

The previous prime is 991983931. The next prime is 991983959. The reversal of 991983946 is 649389199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2317506 + ... + 2317933.

It is an arithmetic number, because the mean of its divisors is an integer number (187735320).

Almost surely, 2^991983946 is an apocalyptic number.

991983946 is a deficient number, since it is larger than the sum of its proper divisors (509898614).

991983946 is a wasteful number, since it uses less digits than its factorization.

991983946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4635548.

The product of its digits is 3779136, while the sum is 58.

The square root of 991983946 is about 31495.7766375113. The cubic root of 991983946 is about 997.3208103533.

The spelling of 991983946 in words is "nine hundred ninety-one million, nine hundred eighty-three thousand, nine hundred forty-six".