78994039 has 8 divisors (see below), whose sum is σ = 83233280. Its totient is φ = 74763000.

The previous prime is 78994033. The next prime is 78994043. The reversal of 78994039 is 93049987.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78994039 - 2³ = 78994031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78993983 and 78994001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78994031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36004 + ... + 38134.

It is an arithmetic number, because the mean of its divisors is an integer number (10404160).

Almost surely, 2^78994039 is an apocalyptic number.

78994039 is a deficient number, since it is larger than the sum of its proper divisors (4239241).

78994039 is a wasteful number, since it uses less digits than its factorization.

78994039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4101.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 78994039 is about 8887.8590785408. The cubic root of 78994039 is about 429.0732501528.

The spelling of 78994039 in words is "seventy-eight million, nine hundred ninety-four thousand, thirty-nine".