3872307121 has 4 divisors (see below), whose sum is σ = 3873911652. Its totient is φ = 3870702592.

The previous prime is 3872307091. The next prime is 3872307137. The reversal of 3872307121 is 1217032783.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1217032783 = 19 ⋅64054357.

It can be written as a sum of positive squares in 2 ways, for example, as 2483626896 + 1388680225 = 49836^2 + 37265^2 .

It is a cyclic number.

It is not a de Polignac number, because 3872307121 - 2¹⁵ = 3872274353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3872307161) 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, 798640 + ... + 803473.

It is an arithmetic number, because the mean of its divisors is an integer number (968477913).

Almost surely, 2^3872307121 is an apocalyptic number.

It is an amenable number.

3872307121 is a deficient number, since it is larger than the sum of its proper divisors (1604531).

3872307121 is a wasteful number, since it uses less digits than its factorization.

3872307121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604530.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 3872307121 is about 62227.8645061840. The cubic root of 3872307121 is about 1570.3263985261.

The spelling of 3872307121 in words is "three billion, eight hundred seventy-two million, three hundred seven thousand, one hundred twenty-one".