78883939 has 4 divisors (see below), whose sum is σ = 78918624. Its totient is φ = 78849256.

The previous prime is 78883901. The next prime is 78883943. The reversal of 78883939 is 93938887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93938887 = 7 ⋅13419841.

It is a cyclic number.

It is not a de Polignac number, because 78883939 - 2⁷ = 78883811 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78883939.

It is not an unprimeable number, because it can be changed into a prime (78883969) 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, 13672 + ... + 18565.

It is an arithmetic number, because the mean of its divisors is an integer number (19729656).

Almost surely, 2^78883939 is an apocalyptic number.

78883939 is a deficient number, since it is larger than the sum of its proper divisors (34685).

78883939 is a wasteful number, since it uses less digits than its factorization.

78883939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34684.

The product of its digits is 2612736, while the sum is 55.

The square root of 78883939 is about 8881.6630762487. The cubic root of 78883939 is about 428.8738134601.

The spelling of 78883939 in words is "seventy-eight million, eight hundred eighty-three thousand, nine hundred thirty-nine".