3020721 has 16 divisors (see below), whose sum is σ = 4423680. Its totient is φ = 1818320.

The previous prime is 3020701. The next prime is 3020761. The reversal of 3020721 is 1270203.

It is a cyclic number.

It is not a de Polignac number, because 3020721 - 2⁶ = 3020657 is a prime.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 3020721.

It is not an unprimeable number, because it can be changed into a prime (3020701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7696 + ... + 8078.

It is an arithmetic number, because the mean of its divisors is an integer number (276480).

Almost surely, 2^3020721 is an apocalyptic number.

It is an amenable number.

3020721 is a deficient number, since it is larger than the sum of its proper divisors (1402959).

3020721 is a wasteful number, since it uses less digits than its factorization.

3020721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636.

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 3020721 is about 1738.0221517576. The cubic root of 3020721 is about 144.5562493781.

Adding to 3020721 its reverse (1270203), we get a palindrome (4290924).

It can be divided in two parts, 3020 and 721, that added together give a triangular number (3741 = T₈₆).

The spelling of 3020721 in words is "three million, twenty thousand, seven hundred twenty-one".