78426137 has 2 divisors, whose sum is σ = 78426138. Its totient is φ = 78426136.

The previous prime is 78426107. The next prime is 78426193. The reversal of 78426137 is 73162487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65545216 + 12880921 = 8096^2 + 3589^2 .

It is a cyclic number.

It is not a de Polignac number, because 78426137 - 2¹² = 78422041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78426137.

It is not a weakly prime, because it can be changed into another prime (78426107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39213068 + 39213069.

It is an arithmetic number, because the mean of its divisors is an integer number (39213069).

Almost surely, 2^78426137 is an apocalyptic number.

It is an amenable number.

78426137 is a deficient number, since it is larger than the sum of its proper divisors (1).

78426137 is an equidigital number, since it uses as much as digits as its factorization.

78426137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 38.

The square root of 78426137 is about 8855.8532621086. The cubic root of 78426137 is about 428.0425486130.

The spelling of 78426137 in words is "seventy-eight million, four hundred twenty-six thousand, one hundred thirty-seven".