3792643721 has 4 divisors (see below), whose sum is σ = 3793042500. Its totient is φ = 3792244944.

The previous prime is 3792643711. The next prime is 3792643843. The reversal of 3792643721 is 1273462973.

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 2443918096 + 1348725625 = 49436^2 + 36725^2 .

It is a cyclic number.

It is not a de Polignac number, because 3792643721 - 2¹⁸ = 3792381577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3792643711) 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, 184766 + ... + 204263.

It is an arithmetic number, because the mean of its divisors is an integer number (948260625).

Almost surely, 2^3792643721 is an apocalyptic number.

It is an amenable number.

3792643721 is a deficient number, since it is larger than the sum of its proper divisors (398779).

3792643721 is an equidigital number, since it uses as much as digits as its factorization.

3792643721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398778.

The product of its digits is 381024, while the sum is 44.

The square root of 3792643721 is about 61584.4438230955. The cubic root of 3792643721 is about 1559.4831348452.

The spelling of 3792643721 in words is "three billion, seven hundred ninety-two million, six hundred forty-three thousand, seven hundred twenty-one".