7921947 has 8 divisors (see below), whose sum is σ = 11522880. Its totient is φ = 4801160.

The previous prime is 7921943. The next prime is 7921981. The reversal of 7921947 is 7491297.

7921947 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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 7921947 - 2² = 7921943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7921943) 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, 119997 + ... + 120062.

It is an arithmetic number, because the mean of its divisors is an integer number (1440360).

Almost surely, 2^7921947 is an apocalyptic number.

7921947 is a deficient number, since it is larger than the sum of its proper divisors (3600933).

7921947 is a wasteful number, since it uses less digits than its factorization.

7921947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240073.

The product of its digits is 31752, while the sum is 39.

The square root of 7921947 is about 2814.5953527994. The cubic root of 7921947 is about 199.3474314204.

The spelling of 7921947 in words is "seven million, nine hundred twenty-one thousand, nine hundred forty-seven".