78543939 has 4 divisors (see below), whose sum is σ = 104725256. Its totient is φ = 52362624.

The previous prime is 78543937. The next prime is 78543943. The reversal of 78543939 is 93934587.

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

It is not a de Polignac number, because 78543939 - 2¹ = 78543937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78543937) 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, 13090654 + ... + 13090659.

It is an arithmetic number, because the mean of its divisors is an integer number (26181314).

Almost surely, 2^78543939 is an apocalyptic number.

78543939 is a deficient number, since it is larger than the sum of its proper divisors (26181317).

78543939 is a wasteful number, since it uses less digits than its factorization.

78543939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26181316.

The product of its digits is 816480, while the sum is 48.

The square root of 78543939 is about 8862.5018476726. The cubic root of 78543939 is about 428.2567588422.

The spelling of 78543939 in words is "seventy-eight million, five hundred forty-three thousand, nine hundred thirty-nine".