3473805721 has 9 divisors (see below), whose sum is σ = 3691231999. Its totient is φ = 3268521184.

The previous prime is 3473805703. The next prime is 3473805733. The reversal of 3473805721 is 1275083743.

It is a happy number.

The square root of 3473805721 is 58939.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2704520025 + 769285696 = 52005^2 + 27736^2 .

It is not a de Polignac number, because 3473805721 - 2⁷ = 3473805593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3473805761) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1000230 + ... + 1003696.

Almost surely, 2^3473805721 is an apocalyptic number.

3473805721 is the 58939-th square number.

3473805721 is the 29470-th centered octagonal number.

It is an amenable number.

3473805721 is a deficient number, since it is larger than the sum of its proper divisors (217426278).

3473805721 is an frugal number, since it uses more digits than its factorization.

3473805721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6968 (or 3484 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 40.

The cubic root of 3473805721 is about 1514.4973183684.

The spelling of 3473805721 in words is "three billion, four hundred seventy-three million, eight hundred five thousand, seven hundred twenty-one".