78135943 has 2 divisors, whose sum is σ = 78135944. Its totient is φ = 78135942.

The previous prime is 78135929. The next prime is 78135979. The reversal of 78135943 is 34953187.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78135943 is a prime.

It is a super-2 number, since 2×78135943² = 12210451176998498, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78135896 and 78135905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78135143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39067971 + 39067972.

It is an arithmetic number, because the mean of its divisors is an integer number (39067972).

Almost surely, 2^78135943 is an apocalyptic number.

78135943 is a deficient number, since it is larger than the sum of its proper divisors (1).

78135943 is an equidigital number, since it uses as much as digits as its factorization.

78135943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The square root of 78135943 is about 8839.4537727170. The cubic root of 78135943 is about 427.5139454886.

The spelling of 78135943 in words is "seventy-eight million, one hundred thirty-five thousand, nine hundred forty-three".