3991089 has 8 divisors (see below), whose sum is σ = 5330752. Its totient is φ = 2656080.

The previous prime is 3991087. The next prime is 3991093. The reversal of 3991089 is 9801993.

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

It is not a de Polignac number, because 3991089 - 2¹ = 3991087 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3991087) 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, 2412 + ... + 3714.

It is an arithmetic number, because the mean of its divisors is an integer number (666344).

Almost surely, 2^3991089 is an apocalyptic number.

It is an amenable number.

3991089 is a deficient number, since it is larger than the sum of its proper divisors (1339663).

3991089 is a wasteful number, since it uses less digits than its factorization.

3991089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2327.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 3991089 is about 1997.7710078986. The cubic root of 3991089 is about 158.6221397978.

The spelling of 3991089 in words is "three million, nine hundred ninety-one thousand, eighty-nine".