78994399 has 4 divisors (see below), whose sum is σ = 86175720. Its totient is φ = 71813080.

The previous prime is 78994369. The next prime is 78994403. The reversal of 78994399 is 99349987.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78994399 - 2¹³ = 78986207 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 (78994339) 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, 3590644 + ... + 3590665.

It is an arithmetic number, because the mean of its divisors is an integer number (21543930).

Almost surely, 2^78994399 is an apocalyptic number.

78994399 is a deficient number, since it is larger than the sum of its proper divisors (7181321).

78994399 is a wasteful number, since it uses less digits than its factorization.

78994399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7181320.

The product of its digits is 4408992, while the sum is 58.

The square root of 78994399 is about 8887.8793308640. The cubic root of 78994399 is about 429.0739019578.

The spelling of 78994399 in words is "seventy-eight million, nine hundred ninety-four thousand, three hundred ninety-nine".