78046139 has 2 divisors, whose sum is σ = 78046140. Its totient is φ = 78046138.

The previous prime is 78046123. The next prime is 78046151. The reversal of 78046139 is 93164087.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78046139 - 2⁴ = 78046123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78046109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39023069 + 39023070.

It is an arithmetic number, because the mean of its divisors is an integer number (39023070).

Almost surely, 2^78046139 is an apocalyptic number.

78046139 is a deficient number, since it is larger than the sum of its proper divisors (1).

78046139 is an equidigital number, since it uses as much as digits as its factorization.

78046139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 78046139 is about 8834.3725866640. The cubic root of 78046139 is about 427.3500978028.

The spelling of 78046139 in words is "seventy-eight million, forty-six thousand, one hundred thirty-nine".