78243959 has 2 divisors, whose sum is σ = 78243960. Its totient is φ = 78243958.

The previous prime is 78243931. The next prime is 78243967. The reversal of 78243959 is 95934287.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78243959 is a prime.

It is a super-2 number, since 2×78243959² = 12244234239987362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78243929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39121979 + 39121980.

It is an arithmetic number, because the mean of its divisors is an integer number (39121980).

Almost surely, 2^78243959 is an apocalyptic number.

78243959 is a deficient number, since it is larger than the sum of its proper divisors (1).

78243959 is an equidigital number, since it uses as much as digits as its factorization.

78243959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 47.

The square root of 78243959 is about 8845.5615423782. The cubic root of 78243959 is about 427.7108547970.

The spelling of 78243959 in words is "seventy-eight million, two hundred forty-three thousand, nine hundred fifty-nine".