8991432 has 32 divisors (see below), whose sum is σ = 24976800. Its totient is φ = 2997072.

The previous prime is 8991431. The next prime is 8991439. The reversal of 8991432 is 2341998.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (8991431) 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, 20598 + ... + 21029.

It is an arithmetic number, because the mean of its divisors is an integer number (780525).

Almost surely, 2^8991432 is an apocalyptic number.

It is an amenable number.

8991432 is an abundant number, since it is smaller than the sum of its proper divisors (15985368).

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

8991432 is a wasteful number, since it uses less digits than its factorization.

8991432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41642 (or 41632 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 8991432 is about 2998.5716599741. The cubic root of 8991432 is about 207.9423533543.

The spelling of 8991432 in words is "eight million, nine hundred ninety-one thousand, four hundred thirty-two".