7640237939 has 2 divisors, whose sum is σ = 7640237940. Its totient is φ = 7640237938.

The previous prime is 7640237887. The next prime is 7640237977. The reversal of 7640237939 is 9397320467.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7640237939 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (7640237989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3820118969 + 3820118970.

It is an arithmetic number, because the mean of its divisors is an integer number (3820118970).

Almost surely, 2^7640237939 is an apocalyptic number.

7640237939 is a deficient number, since it is larger than the sum of its proper divisors (1).

7640237939 is an equidigital number, since it uses as much as digits as its factorization.

7640237939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1714608, while the sum is 50.

The square root of 7640237939 is about 87408.4546196762. The cubic root of 7640237939 is about 1969.5588470807.

The spelling of 7640237939 in words is "seven billion, six hundred forty million, two hundred thirty-seven thousand, nine hundred thirty-nine".