7874386381 has 2 divisors, whose sum is σ = 7874386382. Its totient is φ = 7874386380.

The previous prime is 7874386379. The next prime is 7874386409. The reversal of 7874386381 is 1836834787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5768402500 + 2105983881 = 75950^2 + 45891^2 .

It is a cyclic number.

It is not a de Polignac number, because 7874386381 - 2¹ = 7874386379 is a prime.

It is a super-2 number, since 2×7874386381² (a number of 21 digits) contains 22 as substring.

Together with 7874386379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7874386181) 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, 3937193190 + 3937193191.

It is an arithmetic number, because the mean of its divisors is an integer number (3937193191).

Almost surely, 2^7874386381 is an apocalyptic number.

It is an amenable number.

7874386381 is a deficient number, since it is larger than the sum of its proper divisors (1).

7874386381 is an equidigital number, since it uses as much as digits as its factorization.

7874386381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5419008, while the sum is 55.

The square root of 7874386381 is about 88737.7393277516. The cubic root of 7874386381 is about 1989.4769280006.

The spelling of 7874386381 in words is "seven billion, eight hundred seventy-four million, three hundred eighty-six thousand, three hundred eighty-one".