3440721 has 8 divisors (see below), whose sum is σ = 4735744. Its totient is φ = 2219760.

The previous prime is 3440719. The next prime is 3440771. The reversal of 3440721 is 1270443.

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

It is not a de Polignac number, because 3440721 - 2¹ = 3440719 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3440771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18406 + ... + 18591.

It is an arithmetic number, because the mean of its divisors is an integer number (591968).

Almost surely, 2^3440721 is an apocalyptic number.

3440721 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3440721 is a deficient number, since it is larger than the sum of its proper divisors (1295023).

3440721 is a wasteful number, since it uses less digits than its factorization.

3440721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37031.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 3440721 is about 1854.9180574893. The cubic root of 3440721 is about 150.9673920496.

It can be divided in two parts, 34 and 40721, that added together give a triangular number (40755 = T₂₈₅).

The spelling of 3440721 in words is "three million, four hundred forty thousand, seven hundred twenty-one".