7007721 has 8 divisors (see below), whose sum is σ = 10678464. Its totient is φ = 4004400.

The previous prime is 7007633. The next prime is 7007729. The reversal of 7007721 is 1277007.

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

It is not a de Polignac number, because 7007721 - 2¹¹ = 7005673 is a prime.

It is a super-2 number, since 2×7007721² = 98216307227682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7007691 and 7007700.

It is not an unprimeable number, because it can be changed into a prime (7007729) 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, 166830 + ... + 166871.

It is an arithmetic number, because the mean of its divisors is an integer number (1334808).

Almost surely, 2^7007721 is an apocalyptic number.

It is an amenable number.

7007721 is a deficient number, since it is larger than the sum of its proper divisors (3670743).

7007721 is a wasteful number, since it uses less digits than its factorization.

7007721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333711.

The product of its (nonzero) digits is 686, while the sum is 24.

The square root of 7007721 is about 2647.2100407788. The cubic root of 7007721 is about 191.3634245375.

The spelling of 7007721 in words is "seven million, seven thousand, seven hundred twenty-one".