7970721 has 8 divisors (see below), whose sum is σ = 11593824. Its totient is φ = 4830720.

The previous prime is 7970701. The next prime is 7970731. The reversal of 7970721 is 1270797.

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

It is not a de Polignac number, because 7970721 - 2⁶ = 7970657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 241537 = 7970721 / (7 + 9 + 7 + 0 + 7 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (7970701) 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, 120736 + ... + 120801.

It is an arithmetic number, because the mean of its divisors is an integer number (1449228).

Almost surely, 2^7970721 is an apocalyptic number.

It is an amenable number.

7970721 is a deficient number, since it is larger than the sum of its proper divisors (3623103).

7970721 is a wasteful number, since it uses less digits than its factorization.

7970721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241551.

The product of its (nonzero) digits is 6174, while the sum is 33.

The square root of 7970721 is about 2823.2465354623. The cubic root of 7970721 is about 199.7557100670.

The spelling of 7970721 in words is "seven million, nine hundred seventy thousand, seven hundred twenty-one".