7990991 has 8 divisors (see below), whose sum is σ = 8279040. Its totient is φ = 7707672.

The previous prime is 7990951. The next prime is 7990993. The reversal of 7990991 is 1990997.

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 7990991 - 2¹⁴ = 7974607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7990993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2450 + ... + 4688.

It is an arithmetic number, because the mean of its divisors is an integer number (1034880).

Almost surely, 2^7990991 is an apocalyptic number.

7990991 is a deficient number, since it is larger than the sum of its proper divisors (288049).

7990991 is a wasteful number, since it uses less digits than its factorization.

7990991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2365.

The product of its (nonzero) digits is 45927, while the sum is 44.

The square root of 7990991 is about 2826.8340948842. The cubic root of 7990991 is about 199.9248968011.

The spelling of 7990991 in words is "seven million, nine hundred ninety thousand, nine hundred ninety-one".