3438721 has 16 divisors (see below), whose sum is σ = 4092480. Its totient is φ = 2848320.

The previous prime is 3438713. The next prime is 3438731. The reversal of 3438721 is 1278343.

It is a cyclic number.

It is not a de Polignac number, because 3438721 - 2³ = 3438713 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

3438721 is a Rhonda number in base 16.

Its product of digits (4032) is a multiple of the sum of its prime divisors (336).

It is a self number, because there is not a number n which added to its sum of digits gives 3438721.

It is not an unprimeable number, because it can be changed into a prime (3438731) 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, 19791 + ... + 19963.

It is an arithmetic number, because the mean of its divisors is an integer number (255780).

Almost surely, 2^3438721 is an apocalyptic number.

It is an amenable number.

3438721 is a deficient number, since it is larger than the sum of its proper divisors (653759).

3438721 is a wasteful number, since it uses less digits than its factorization.

3438721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336.

The product of its digits is 4032, while the sum is 28.

The square root of 3438721 is about 1854.3788717519. The cubic root of 3438721 is about 150.9381352645.

The spelling of 3438721 in words is "three million, four hundred thirty-eight thousand, seven hundred twenty-one".