78904943 has 4 divisors (see below), whose sum is σ = 84974568. Its totient is φ = 72835320.

The previous prime is 78904933. The next prime is 78904949. The reversal of 78904943 is 34940987.

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 78904943 - 2¹⁴ = 78888559 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78904894 and 78904903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78904949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3034793 + ... + 3034818.

It is an arithmetic number, because the mean of its divisors is an integer number (21243642).

Almost surely, 2^78904943 is an apocalyptic number.

78904943 is a deficient number, since it is larger than the sum of its proper divisors (6069625).

78904943 is a wasteful number, since it uses less digits than its factorization.

78904943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6069624.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 78904943 is about 8882.8454337560. The cubic root of 78904943 is about 428.9118747195.

The spelling of 78904943 in words is "seventy-eight million, nine hundred four thousand, nine hundred forty-three".