3840721939 has 2 divisors, whose sum is σ = 3840721940. Its totient is φ = 3840721938.

The previous prime is 3840721877. The next prime is 3840721943. The reversal of 3840721939 is 9391270483.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3840721939 - 2¹⁷ = 3840590867 is a prime.

It is a super-2 number, since 2×3840721939² = 29502290025431839442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3840721139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1920360969 + 1920360970.

It is an arithmetic number, because the mean of its divisors is an integer number (1920360970).

Almost surely, 2^3840721939 is an apocalyptic number.

3840721939 is a deficient number, since it is larger than the sum of its proper divisors (1).

3840721939 is an equidigital number, since it uses as much as digits as its factorization.

3840721939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 3840721939 is about 61973.5583858148. The cubic root of 3840721939 is about 1566.0451855831.

The spelling of 3840721939 in words is "three billion, eight hundred forty million, seven hundred twenty-one thousand, nine hundred thirty-nine".