78919 has 2 divisors, whose sum is σ = 78920. Its totient is φ = 78918.

The previous prime is 78901. The next prime is 78929. The reversal of 78919 is 91987.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78919 - 2⁵ = 78887 is a prime.

It is a super-2 number, since 2×78919² = 12456417122, which contains 22 as substring.

78919 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39459 + 39460.

It is an arithmetic number, because the mean of its divisors is an integer number (39460).

2⁷⁸⁹¹⁹ is an apocalyptic number.

78919 is a deficient number, since it is larger than the sum of its proper divisors (1).

78919 is an equidigital number, since it uses as much as digits as its factorization.

78919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 34.

The square root of 78919 is about 280.9252569635. The cubic root of 78919 is about 42.8937343577.

It can be divided in two parts, 789 and 19, that added together give a palindrome (808).

The spelling of 78919 in words is "seventy-eight thousand, nine hundred nineteen".