7961786387 has 2 divisors, whose sum is σ = 7961786388. Its totient is φ = 7961786386.

The previous prime is 7961786383. The next prime is 7961786461. The reversal of 7961786387 is 7836871697.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7961786387 - 2² = 7961786383 is a prime.

It is not a weakly prime, because it can be changed into another prime (7961786383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3980893193 + 3980893194.

It is an arithmetic number, because the mean of its divisors is an integer number (3980893194).

Almost surely, 2^7961786387 is an apocalyptic number.

7961786387 is a deficient number, since it is larger than the sum of its proper divisors (1).

7961786387 is an equidigital number, since it uses as much as digits as its factorization.

7961786387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21337344, while the sum is 62.

The square root of 7961786387 is about 89228.8427976066. The cubic root of 7961786387 is about 1996.8104483341.

The spelling of 7961786387 in words is "seven billion, nine hundred sixty-one million, seven hundred eighty-six thousand, three hundred eighty-seven".