7939947 has 4 divisors (see below), whose sum is σ = 10586600. Its totient is φ = 5293296.

The previous prime is 7939933. The next prime is 7939949. The reversal of 7939947 is 7499397.

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

It is not a de Polignac number, because 7939947 - 2⁴ = 7939931 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7939896 and 7939905.

It is not an unprimeable number, because it can be changed into a prime (7939949) 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, 1323322 + ... + 1323327.

It is an arithmetic number, because the mean of its divisors is an integer number (2646650).

Almost surely, 2^7939947 is an apocalyptic number.

7939947 is a deficient number, since it is larger than the sum of its proper divisors (2646653).

7939947 is a wasteful number, since it uses less digits than its factorization.

7939947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2646652.

The product of its digits is 428652, while the sum is 48.

The square root of 7939947 is about 2817.7911562073. The cubic root of 7939947 is about 199.4983008756.

The spelling of 7939947 in words is "seven million, nine hundred thirty-nine thousand, nine hundred forty-seven".