77900243 has 2 divisors, whose sum is σ = 77900244. Its totient is φ = 77900242.

The previous prime is 77900227. The next prime is 77900257. The reversal of 77900243 is 34200977.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77900243 - 2⁴ = 77900227 is a prime.

It is not a weakly prime, because it can be changed into another prime (77900143) 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, 38950121 + 38950122.

It is an arithmetic number, because the mean of its divisors is an integer number (38950122).

Almost surely, 2^77900243 is an apocalyptic number.

77900243 is a deficient number, since it is larger than the sum of its proper divisors (1).

77900243 is an equidigital number, since it uses as much as digits as its factorization.

77900243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 77900243 is about 8826.1114314289. Note that the first 3 decimals coincide. The cubic root of 77900243 is about 427.0836419103.

The spelling of 77900243 in words is "seventy-seven million, nine hundred thousand, two hundred forty-three".