78897943 has 2 divisors, whose sum is σ = 78897944. Its totient is φ = 78897942.

The previous prime is 78897919. The next prime is 78897947. The reversal of 78897943 is 34979887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78897943 - 2²¹ = 76800791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78897947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39448971 + 39448972.

It is an arithmetic number, because the mean of its divisors is an integer number (39448972).

Almost surely, 2^78897943 is an apocalyptic number.

78897943 is a deficient number, since it is larger than the sum of its proper divisors (1).

78897943 is an equidigital number, since it uses as much as digits as its factorization.

78897943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 55.

The square root of 78897943 is about 8882.4514071286. The cubic root of 78897943 is about 428.8991907997.

The spelling of 78897943 in words is "seventy-eight million, eight hundred ninety-seven thousand, nine hundred forty-three".