4088991 has 4 divisors (see below), whose sum is σ = 5451992. Its totient is φ = 2725992.

The previous prime is 4088977. The next prime is 4089011. The reversal of 4088991 is 1998804.

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

It is not a de Polignac number, because 4088991 - 2⁷ = 4088863 is a prime.

It is a D-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 (4088911) 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, 681496 + ... + 681501.

It is an arithmetic number, because the mean of its divisors is an integer number (1362998).

Almost surely, 2^4088991 is an apocalyptic number.

4088991 is a deficient number, since it is larger than the sum of its proper divisors (1363001).

4088991 is a wasteful number, since it uses less digits than its factorization.

4088991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363000.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 4088991 is about 2022.1253670334. The cubic root of 4088991 is about 159.9086848738.

The spelling of 4088991 in words is "four million, eighty-eight thousand, nine hundred ninety-one".