8939991 has 4 divisors (see below), whose sum is σ = 11919992. Its totient is φ = 5959992.

The previous prime is 8939989. The next prime is 8939993. The reversal of 8939991 is 1999398.

8939991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (8939989) and next prime (8939993).

It is not a de Polignac number, because 8939991 - 2¹ = 8939989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8939991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8939993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1489996 + ... + 1490001.

It is an arithmetic number, because the mean of its divisors is an integer number (2979998).

Almost surely, 2^8939991 is an apocalyptic number.

8939991 is a deficient number, since it is larger than the sum of its proper divisors (2980001).

8939991 is a wasteful number, since it uses less digits than its factorization.

8939991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2980000.

The product of its digits is 157464, while the sum is 48.

The square root of 8939991 is about 2989.9817725197. The cubic root of 8939991 is about 207.5450407863.

The spelling of 8939991 in words is "eight million, nine hundred thirty-nine thousand, nine hundred ninety-one".