3438780721 has 8 divisors (see below), whose sum is σ = 3681122400. Its totient is φ = 3202574400.

The previous prime is 3438780677. The next prime is 3438780731. The reversal of 3438780721 is 1270878343.

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

It is a cyclic number.

It is not a de Polignac number, because 3438780721 - 2²³ = 3430392113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3438780731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1532680 + ... + 1534921.

It is an arithmetic number, because the mean of its divisors is an integer number (460140300).

Almost surely, 2^3438780721 is an apocalyptic number.

It is an amenable number.

3438780721 is a deficient number, since it is larger than the sum of its proper divisors (242341679).

3438780721 is a wasteful number, since it uses less digits than its factorization.

3438780721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3067679.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 3438780721 is about 58641.1180060544. The cubic root of 3438780721 is about 1509.3900905098.

The spelling of 3438780721 in words is "three billion, four hundred thirty-eight million, seven hundred eighty thousand, seven hundred twenty-one".