7964721 has 12 divisors (see below), whose sum is σ = 12181572. Its totient is φ = 4997376.

The previous prime is 7964717. The next prime is 7964729. The reversal of 7964721 is 1274697.

It is a happy number.

7964721 is a `hidden beast` number, since 7 + 9 + 647 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5934096 + 2030625 = 2436^2 + 1425^2 .

It is not a de Polignac number, because 7964721 - 2² = 7964717 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (7964729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25876 + ... + 26181.

It is an arithmetic number, because the mean of its divisors is an integer number (1015131).

Almost surely, 2^7964721 is an apocalyptic number.

It is an amenable number.

7964721 is a deficient number, since it is larger than the sum of its proper divisors (4216851).

7964721 is a wasteful number, since it uses less digits than its factorization.

7964721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52080 (or 52077 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 7964721 is about 2822.1837289588. The cubic root of 7964721 is about 199.7055751160.

The spelling of 7964721 in words is "seven million, nine hundred sixty-four thousand, seven hundred twenty-one".