7998591 has 4 divisors (see below), whose sum is σ = 10664792. Its totient is φ = 5332392.

The previous prime is 7998569. The next prime is 7998593. The reversal of 7998591 is 1958997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1958997 = 3 ⋅652999.

It is a de Polignac number, because none of the positive numbers 2^k-7998591 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 7998591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7998593) 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, 1333096 + ... + 1333101.

It is an arithmetic number, because the mean of its divisors is an integer number (2666198).

Almost surely, 2^7998591 is an apocalyptic number.

7998591 is a deficient number, since it is larger than the sum of its proper divisors (2666201).

7998591 is a wasteful number, since it uses less digits than its factorization.

7998591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2666200.

The product of its digits is 204120, while the sum is 48.

The square root of 7998591 is about 2828.1780354143. The cubic root of 7998591 is about 199.9882576439.

The spelling of 7998591 in words is "seven million, nine hundred ninety-eight thousand, five hundred ninety-one".