3246721 has 2 divisors, whose sum is σ = 3246722. Its totient is φ = 3246720.

The previous prime is 3246709. The next prime is 3246743. The reversal of 3246721 is 1276423.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2436721 + 810000 = 1561^2 + 900^2 .

It is a cyclic number.

It is not a de Polignac number, because 3246721 - 2⁵ = 3246689 is a prime.

It is a super-4 number, since 4×3246721⁴ (a number of 27 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (3246751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1623360 + 1623361.

It is an arithmetic number, because the mean of its divisors is an integer number (1623361).

Almost surely, 2^3246721 is an apocalyptic number.

It is an amenable number.

3246721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3246721 is an equidigital number, since it uses as much as digits as its factorization.

3246721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 25.

The square root of 3246721 is about 1801.8659772580. The cubic root of 3246721 is about 148.0749711468.

It can be divided in two parts, 3246 and 721, that multiplied together give a triangular number (2340366 = T₂₁₆₃).

The spelling of 3246721 in words is "three million, two hundred forty-six thousand, seven hundred twenty-one".