3840721943 has 2 divisors, whose sum is σ = 3840721944. Its totient is φ = 3840721942.

The previous prime is 3840721939. The next prime is 3840721987. The reversal of 3840721943 is 3491270483.

3840721943 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3840721943 - 2² = 3840721939 is a prime.

It is a super-2 number, since 2×3840721943² = 29502290086883390498, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3840721943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3840721993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1920360971 + 1920360972.

It is an arithmetic number, because the mean of its divisors is an integer number (1920360972).

Almost surely, 2^3840721943 is an apocalyptic number.

3840721943 is a deficient number, since it is larger than the sum of its proper divisors (1).

3840721943 is an equidigital number, since it uses as much as digits as its factorization.

3840721943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 3840721943 is about 61973.5584180867. The cubic root of 3840721943 is about 1566.0451861268.

The spelling of 3840721943 in words is "three billion, eight hundred forty million, seven hundred twenty-one thousand, nine hundred forty-three".