78343841 has 2 divisors, whose sum is σ = 78343842. Its totient is φ = 78343840.

The previous prime is 78343823. The next prime is 78343847. The reversal of 78343841 is 14834387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70896400 + 7447441 = 8420^2 + 2729^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78343841 is a prime.

It is a super-2 number, since 2×78343841² = 12275514845266562, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78343795 and 78343804.

It is not a weakly prime, because it can be changed into another prime (78343847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39171920 + 39171921.

It is an arithmetic number, because the mean of its divisors is an integer number (39171921).

Almost surely, 2^78343841 is an apocalyptic number.

It is an amenable number.

78343841 is a deficient number, since it is larger than the sum of its proper divisors (1).

78343841 is an equidigital number, since it uses as much as digits as its factorization.

78343841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 38.

The square root of 78343841 is about 8851.2056240944. The cubic root of 78343841 is about 427.8927749127.

The spelling of 78343841 in words is "seventy-eight million, three hundred forty-three thousand, eight hundred forty-one".