78404243 has 2 divisors, whose sum is σ = 78404244. Its totient is φ = 78404242.

The previous prime is 78404233. The next prime is 78404257. The reversal of 78404243 is 34240487.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78404243 - 2¹⁰ = 78403219 is a prime.

It is a super-2 number, since 2×78404243² = 12294450640806098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78404213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39202121 + 39202122.

It is an arithmetic number, because the mean of its divisors is an integer number (39202122).

Almost surely, 2^78404243 is an apocalyptic number.

78404243 is a deficient number, since it is larger than the sum of its proper divisors (1).

78404243 is an equidigital number, since it uses as much as digits as its factorization.

78404243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 32.

The square root of 78404243 is about 8854.6170442318. The cubic root of 78404243 is about 428.0027131019.

The spelling of 78404243 in words is "seventy-eight million, four hundred four thousand, two hundred forty-three".