78392038 has 4 divisors (see below), whose sum is σ = 117588060. Its totient is φ = 39196018.

The previous prime is 78392033. The next prime is 78392051. The reversal of 78392038 is 83029387.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×78392038² = 12290623243586888, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78392033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19598008 + ... + 19598011.

It is an arithmetic number, because the mean of its divisors is an integer number (29397015).

Almost surely, 2^78392038 is an apocalyptic number.

78392038 is a deficient number, since it is larger than the sum of its proper divisors (39196022).

78392038 is a wasteful number, since it uses less digits than its factorization.

78392038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39196021.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 78392038 is about 8853.9278289356. The cubic root of 78392038 is about 427.9805032316.

The spelling of 78392038 in words is "seventy-eight million, three hundred ninety-two thousand, thirty-eight".