78239023 has 2 divisors, whose sum is σ = 78239024. Its totient is φ = 78239022.

The previous prime is 78238997. The next prime is 78239033. The reversal of 78239023 is 32093287.

It is a strong prime.

It is an emirp because it is prime and its reverse (32093287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78239023 - 2¹⁷ = 78107951 is a prime.

It is a super-2 number, since 2×78239023² = 12242689439989058, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78239023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78239033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39119511 + 39119512.

It is an arithmetic number, because the mean of its divisors is an integer number (39119512).

Almost surely, 2^78239023 is an apocalyptic number.

78239023 is a deficient number, since it is larger than the sum of its proper divisors (1).

78239023 is an equidigital number, since it uses as much as digits as its factorization.

78239023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 78239023 is about 8845.2825279920. The cubic root of 78239023 is about 427.7018605982.

The spelling of 78239023 in words is "seventy-eight million, two hundred thirty-nine thousand, twenty-three".