3806552721 has 4 divisors (see below), whose sum is σ = 5075403632. Its totient is φ = 2537701812.

The previous prime is 3806552707. The next prime is 3806552759. The reversal of 3806552721 is 1272556083.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3806552721 - 2¹¹ = 3806550673 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3806552721.

It is not an unprimeable number, because it can be changed into a prime (3806552521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 634425451 + ... + 634425456.

It is an arithmetic number, because the mean of its divisors is an integer number (1268850908).

Almost surely, 2^3806552721 is an apocalyptic number.

It is an amenable number.

3806552721 is a deficient number, since it is larger than the sum of its proper divisors (1268850911).

3806552721 is a wasteful number, since it uses less digits than its factorization.

3806552721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268850910.

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 3806552721 is about 61697.2667222787. The cubic root of 3806552721 is about 1561.3872058431.

The spelling of 3806552721 in words is "three billion, eight hundred six million, five hundred fifty-two thousand, seven hundred twenty-one".