78199039 has 4 divisors (see below), whose sum is σ = 78481624. Its totient is φ = 77916456.

The previous prime is 78199027. The next prime is 78199067. The reversal of 78199039 is 93099187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93099187 = 829 ⋅112303.

It is a cyclic number.

It is not a de Polignac number, because 78199039 - 2¹⁷ = 78067967 is a prime.

It is a super-2 number, since 2×78199039² = 12230179401047042, which contains 22 as substring.

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 78199039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78199139) 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, 140877 + ... + 141430.

It is an arithmetic number, because the mean of its divisors is an integer number (19620406).

Almost surely, 2^78199039 is an apocalyptic number.

78199039 is a deficient number, since it is larger than the sum of its proper divisors (282585).

78199039 is a wasteful number, since it uses less digits than its factorization.

78199039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282584.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 78199039 is about 8843.0220513125. The cubic root of 78199039 is about 427.6289892673.

The spelling of 78199039 in words is "seventy-eight million, one hundred ninety-nine thousand, thirty-nine".