77397427 has 2 divisors, whose sum is σ = 77397428. Its totient is φ = 77397426.

The previous prime is 77397407. The next prime is 77397443. The reversal of 77397427 is 72479377.

It is a strong prime.

It is an emirp because it is prime and its reverse (72479377) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77397427 is a prime.

It is not a weakly prime, because it can be changed into another prime (77397407) 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, 38698713 + 38698714.

It is an arithmetic number, because the mean of its divisors is an integer number (38698714).

Almost surely, 2^77397427 is an apocalyptic number.

77397427 is a deficient number, since it is larger than the sum of its proper divisors (1).

77397427 is an equidigital number, since it uses as much as digits as its factorization.

77397427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518616, while the sum is 46.

The square root of 77397427 is about 8797.5807470008. The cubic root of 77397427 is about 426.1627710842.

The spelling of 77397427 in words is "seventy-seven million, three hundred ninety-seven thousand, four hundred twenty-seven".