78979423 has 4 divisors (see below), whose sum is σ = 81114040. Its totient is φ = 76844808.

The previous prime is 78979421. The next prime is 78979451. The reversal of 78979423 is 32497987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32497987 = 179 ⋅181553.

It is a cyclic number.

It is not a de Polignac number, because 78979423 - 2¹ = 78979421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78979421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067253 + ... + 1067326.

It is an arithmetic number, because the mean of its divisors is an integer number (20278510).

Almost surely, 2^78979423 is an apocalyptic number.

78979423 is a deficient number, since it is larger than the sum of its proper divisors (2134617).

78979423 is a wasteful number, since it uses less digits than its factorization.

78979423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2134616.

The product of its digits is 762048, while the sum is 49.

The square root of 78979423 is about 8887.0367952428. The cubic root of 78979423 is about 429.0467851961.

The spelling of 78979423 in words is "seventy-eight million, nine hundred seventy-nine thousand, four hundred twenty-three".