7989947 has 8 divisors (see below), whose sum is σ = 9528576. Its totient is φ = 6550632.

The previous prime is 7989929. The next prime is 7989973. The reversal of 7989947 is 7499897.

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 7989947 - 2¹⁰ = 7988923 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7989907) 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, 24653 + ... + 24974.

It is an arithmetic number, because the mean of its divisors is an integer number (1191072).

Almost surely, 2^7989947 is an apocalyptic number.

7989947 is a deficient number, since it is larger than the sum of its proper divisors (1538629).

7989947 is a wasteful number, since it uses less digits than its factorization.

7989947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49657.

The product of its digits is 1143072, while the sum is 53.

The square root of 7989947 is about 2826.6494299789. The cubic root of 7989947 is about 199.9161898842.

The spelling of 7989947 in words is "seven million, nine hundred eighty-nine thousand, nine hundred forty-seven".