4356873721 has 4 divisors (see below), whose sum is σ = 4367848612. Its totient is φ = 4345898832.

The previous prime is 4356873701. The next prime is 4356873737. The reversal of 4356873721 is 1273786534.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3737610496 + 619263225 = 61136^2 + 24885^2 .

It is a cyclic number.

It is not a de Polignac number, because 4356873721 - 2¹³ = 4356865529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4356873701) 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 3 ways as a sum of consecutive naturals, for example, 5486850 + ... + 5487643.

It is an arithmetic number, because the mean of its divisors is an integer number (1091962153).

Almost surely, 2^4356873721 is an apocalyptic number.

It is an amenable number.

4356873721 is a deficient number, since it is larger than the sum of its proper divisors (10974891).

4356873721 is a wasteful number, since it uses less digits than its factorization.

4356873721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10974890.

The product of its digits is 846720, while the sum is 46.

The square root of 4356873721 is about 66006.6187666055. The cubic root of 4356873721 is about 1633.2712756606.

The spelling of 4356873721 in words is "four billion, three hundred fifty-six million, eight hundred seventy-three thousand, seven hundred twenty-one".