3451721 has 16 divisors (see below), whose sum is σ = 4308864. Its totient is φ = 2692224.

The previous prime is 3451699. The next prime is 3451759. The reversal of 3451721 is 1271543.

3451721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3451721 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3451781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7325 + ... + 7781.

It is an arithmetic number, because the mean of its divisors is an integer number (269304).

Almost surely, 2^3451721 is an apocalyptic number.

It is an amenable number.

3451721 is a deficient number, since it is larger than the sum of its proper divisors (857143).

3451721 is a wasteful number, since it uses less digits than its factorization.

3451721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560.

The product of its digits is 840, while the sum is 23.

The square root of 3451721 is about 1857.8807819664. The cubic root of 3451721 is about 151.1281020439.

The spelling of 3451721 in words is "three million, four hundred fifty-one thousand, seven hundred twenty-one".