8689991 has 8 divisors (see below), whose sum is σ = 8958768. Its totient is φ = 8424000.

The previous prime is 8689987. The next prime is 8689997. The reversal of 8689991 is 1999868.

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

It is a cyclic number.

It is not a de Polignac number, because 8689991 - 2² = 8689987 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8689997) 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, 6836 + ... + 8006.

It is an arithmetic number, because the mean of its divisors is an integer number (1119846).

Almost surely, 2^8689991 is an apocalyptic number.

8689991 is a deficient number, since it is larger than the sum of its proper divisors (268777).

8689991 is a wasteful number, since it uses less digits than its factorization.

8689991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393.

The product of its digits is 279936, while the sum is 50.

The square root of 8689991 is about 2947.8790680759. The cubic root of 8689991 is about 205.5921092800.

The spelling of 8689991 in words is "eight million, six hundred eighty-nine thousand, nine hundred ninety-one".