78495139 has 2 divisors, whose sum is σ = 78495140. Its totient is φ = 78495138.

The previous prime is 78495127. The next prime is 78495161. The reversal of 78495139 is 93159487.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (93159487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78495139 - 2¹¹ = 78493091 is a prime.

It is a super-2 number, since 2×78495139² = 12322973693258642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78496139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39247569 + 39247570.

It is an arithmetic number, because the mean of its divisors is an integer number (39247570).

Almost surely, 2^78495139 is an apocalyptic number.

78495139 is a deficient number, since it is larger than the sum of its proper divisors (1).

78495139 is an equidigital number, since it uses as much as digits as its factorization.

78495139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 46.

The square root of 78495139 is about 8859.7482469876. The cubic root of 78495139 is about 428.1680473099.

The spelling of 78495139 in words is "seventy-eight million, four hundred ninety-five thousand, one hundred thirty-nine".