7959921 has 8 divisors (see below), whose sum is σ = 10900224. Its totient is φ = 5163120.

The previous prime is 7959907. The next prime is 7959929. The reversal of 7959921 is 1299597.

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

It is not a de Polignac number, because 7959921 - 2⁶ = 7959857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7959929) 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, 35745 + ... + 35966.

It is an arithmetic number, because the mean of its divisors is an integer number (1362528).

Almost surely, 2^7959921 is an apocalyptic number.

It is an amenable number.

7959921 is a deficient number, since it is larger than the sum of its proper divisors (2940303).

7959921 is a wasteful number, since it uses less digits than its factorization.

7959921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71751.

The product of its digits is 51030, while the sum is 42.

The square root of 7959921 is about 2821.3331954946. Note that the first 3 decimals coincide. The cubic root of 7959921 is about 199.6654490236.

The spelling of 7959921 in words is "seven million, nine hundred fifty-nine thousand, nine hundred twenty-one".