78397379 has 2 divisors, whose sum is σ = 78397380. Its totient is φ = 78397378.

The previous prime is 78397373. The next prime is 78397399. The reversal of 78397379 is 97379387.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78397379 is a prime.

It is a super-2 number, since 2×78397379² = 12292298068139282, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78397379.

It is not a weakly prime, because it can be changed into another prime (78397373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39198689 + 39198690.

It is an arithmetic number, because the mean of its divisors is an integer number (39198690).

Almost surely, 2^78397379 is an apocalyptic number.

78397379 is a deficient number, since it is larger than the sum of its proper divisors (1).

78397379 is an equidigital number, since it uses as much as digits as its factorization.

78397379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2000376, while the sum is 53.

The square root of 78397379 is about 8854.2294413461. The cubic root of 78397379 is about 427.9902227219.

The spelling of 78397379 in words is "seventy-eight million, three hundred ninety-seven thousand, three hundred seventy-nine".