78038393 has 4 divisors (see below), whose sum is σ = 78109008. Its totient is φ = 77967780.

The previous prime is 78038383. The next prime is 78038413. The reversal of 78038393 is 39383087.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39383087 = 1063 ⋅37049.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78038393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78038393.

It is not an unprimeable number, because it can be changed into a prime (78038383) 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, 33623 + ... + 35868.

It is an arithmetic number, because the mean of its divisors is an integer number (19527252).

Almost surely, 2^78038393 is an apocalyptic number.

It is an amenable number.

78038393 is a deficient number, since it is larger than the sum of its proper divisors (70615).

78038393 is a wasteful number, since it uses less digits than its factorization.

78038393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70614.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 78038393 is about 8833.9341745340. The cubic root of 78038393 is about 427.3359593141.

The spelling of 78038393 in words is "seventy-eight million, thirty-eight thousand, three hundred ninety-three".