77394137 has 2 divisors, whose sum is σ = 77394138. Its totient is φ = 77394136.

The previous prime is 77394113. The next prime is 77394173. The reversal of 77394137 is 73149377.

It is a happy number.

Together with next prime (77394173) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60902416 + 16491721 = 7804^2 + 4061^2 .

It is a cyclic number.

It is not a de Polignac number, because 77394137 - 2⁸ = 77393881 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 77394094 and 77394103.

It is not a weakly prime, because it can be changed into another prime (77394337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38697068 + 38697069.

It is an arithmetic number, because the mean of its divisors is an integer number (38697069).

Almost surely, 2^77394137 is an apocalyptic number.

It is an amenable number.

77394137 is a deficient number, since it is larger than the sum of its proper divisors (1).

77394137 is an equidigital number, since it uses as much as digits as its factorization.

77394137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 111132, while the sum is 41.

The square root of 77394137 is about 8797.3937617910. The cubic root of 77394137 is about 426.1567325743.

The spelling of 77394137 in words is "seventy-seven million, three hundred ninety-four thousand, one hundred thirty-seven".