3366721 has 4 divisors (see below), whose sum is σ = 3372372. Its totient is φ = 3361072.

The previous prime is 3366709. The next prime is 3366739. The reversal of 3366721 is 1276633.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1276633 = 1049 ⋅1217.

It can be written as a sum of positive squares in 2 ways, for example, as 2958400 + 408321 = 1720^2 + 639^2 .

It is a cyclic number.

It is not a de Polignac number, because 3366721 - 2⁵ = 3366689 is a prime.

It is a super-2 number, since 2×3366721² = 22669620583682, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3366721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3366821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1810 + ... + 3163.

It is an arithmetic number, because the mean of its divisors is an integer number (843093).

Almost surely, 2^3366721 is an apocalyptic number.

It is an amenable number.

3366721 is a deficient number, since it is larger than the sum of its proper divisors (5651).

3366721 is an equidigital number, since it uses as much as digits as its factorization.

3366721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5650.

The product of its digits is 4536, while the sum is 28.

The square root of 3366721 is about 1834.8626651605. The cubic root of 3366721 is about 149.8772477214.

The spelling of 3366721 in words is "three million, three hundred sixty-six thousand, seven hundred twenty-one".