78041839 has 2 divisors, whose sum is σ = 78041840. Its totient is φ = 78041838.

The previous prime is 78041741. The next prime is 78041867. The reversal of 78041839 is 93814087.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78041839 - 2¹³ = 78033647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78041039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39020919 + 39020920.

It is an arithmetic number, because the mean of its divisors is an integer number (39020920).

Almost surely, 2^78041839 is an apocalyptic number.

78041839 is a deficient number, since it is larger than the sum of its proper divisors (1).

78041839 is an equidigital number, since it uses as much as digits as its factorization.

78041839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 78041839 is about 8834.1292157179. The cubic root of 78041839 is about 427.3422492866.

The spelling of 78041839 in words is "seventy-eight million, forty-one thousand, eight hundred thirty-nine".