78074939 has 4 divisors (see below), whose sum is σ = 78094800. Its totient is φ = 78055080.

The previous prime is 78074929. The next prime is 78074981. The reversal of 78074939 is 93947087.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93947087 = 13 ⋅7226699.

It is a cyclic number.

It is not a de Polignac number, because 78074939 - 2²⁰ = 77026363 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78074893 and 78074902.

It is not an unprimeable number, because it can be changed into a prime (78074929) 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, 1832 + ... + 12629.

It is an arithmetic number, because the mean of its divisors is an integer number (19523700).

Almost surely, 2^78074939 is an apocalyptic number.

78074939 is a deficient number, since it is larger than the sum of its proper divisors (19861).

78074939 is a wasteful number, since it uses less digits than its factorization.

78074939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19860.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 78074939 is about 8836.0024332274. The cubic root of 78074939 is about 427.4026571794.

The spelling of 78074939 in words is "seventy-eight million, seventy-four thousand, nine hundred thirty-nine".