78397373 has 2 divisors, whose sum is σ = 78397374. Its totient is φ = 78397372.

The previous prime is 78397367. The next prime is 78397379. The reversal of 78397373 is 37379387.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (78397367) and next prime (78397379).

It can be written as a sum of positive squares in only one way, i.e., 75568249 + 2829124 = 8693^2 + 1682^2 .

It is an emirp because it is prime and its reverse (37379387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78397373 - 2¹⁸ = 78135229 is a prime.

It is a super-2 number, since 2×78397373² = 12292296186602258, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78397379) 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, 39198686 + 39198687.

It is an arithmetic number, because the mean of its divisors is an integer number (39198687).

Almost surely, 2^78397373 is an apocalyptic number.

It is an amenable number.

78397373 is a deficient number, since it is larger than the sum of its proper divisors (1).

78397373 is an equidigital number, since it uses as much as digits as its factorization.

78397373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 666792, while the sum is 47.

The square root of 78397373 is about 8854.2291025250. The cubic root of 78397373 is about 427.9902118034.

The spelling of 78397373 in words is "seventy-eight million, three hundred ninety-seven thousand, three hundred seventy-three".