991408332 has 24 divisors (see below), whose sum is σ = 2326662576. Its totient is φ = 328558528.

The previous prime is 991408289. The next prime is 991408333. The reversal of 991408332 is 233804199.

It is a super-3 number, since 3×991408332³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (991408333) 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, 236703 + ... + 240854.

It is an arithmetic number, because the mean of its divisors is an integer number (96944274).

Almost surely, 2^991408332 is an apocalyptic number.

It is an amenable number.

991408332 is an abundant number, since it is smaller than the sum of its proper divisors (1335254244).

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

991408332 is a wasteful number, since it uses less digits than its factorization.

991408332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477737 (or 477735 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 991408332 is about 31486.6373561865. The cubic root of 991408332 is about 997.1278694302.

The spelling of 991408332 in words is "nine hundred ninety-one million, four hundred eight thousand, three hundred thirty-two".