7936991 has 4 divisors (see below), whose sum is σ = 7945800. Its totient is φ = 7928184.

The previous prime is 7936987. The next prime is 7936997. The reversal of 7936991 is 1996397.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 7936991 - 2² = 7936987 is a prime.

It is a super-2 number, since 2×7936991² = 125991652268162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7936997) 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, 2876 + ... + 4913.

It is an arithmetic number, because the mean of its divisors is an integer number (1986450).

Almost surely, 2^7936991 is an apocalyptic number.

7936991 is a deficient number, since it is larger than the sum of its proper divisors (8809).

7936991 is a wasteful number, since it uses less digits than its factorization.

7936991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8808.

The product of its digits is 91854, while the sum is 44.

The square root of 7936991 is about 2817.2665830553. The cubic root of 7936991 is about 199.4735404175.

The spelling of 7936991 in words is "seven million, nine hundred thirty-six thousand, nine hundred ninety-one".