7939997 has 8 divisors (see below), whose sum is σ = 8846040. Its totient is φ = 7076160.

The previous prime is 7939979. The next prime is 7940011. The reversal of 7939997 is 7999397.

It can be written as a sum of positive squares in 4 ways, for example, as 2247001 + 5692996 = 1499^2 + 2386^2 .

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

It is not a de Polignac number, because 7939997 - 2⁶ = 7939933 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 (7939597) 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, 10154 + ... + 10907.

It is an arithmetic number, because the mean of its divisors is an integer number (1105755).

Almost surely, 2^7939997 is an apocalyptic number.

It is an amenable number.

7939997 is a deficient number, since it is larger than the sum of its proper divisors (906043).

7939997 is a wasteful number, since it uses less digits than its factorization.

7939997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21103.

The product of its digits is 964467, while the sum is 53.

The square root of 7939997 is about 2817.8000283909. The cubic root of 7939997 is about 199.4987196397.

The spelling of 7939997 in words is "seven million, nine hundred thirty-nine thousand, nine hundred ninety-seven".