1423805749 has 2 divisors, whose sum is σ = 1423805750. Its totient is φ = 1423805748.

The previous prime is 1423805693. The next prime is 1423805881. The reversal of 1423805749 is 9475083241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1385179524 + 38626225 = 37218^2 + 6215^2 .

It is a cyclic number.

It is not a de Polignac number, because 1423805749 - 2²¹ = 1421708597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1423802749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 711902874 + 711902875.

It is an arithmetic number, because the mean of its divisors is an integer number (711902875).

Almost surely, 2^1423805749 is an apocalyptic number.

It is an amenable number.

1423805749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1423805749 is an equidigital number, since it uses as much as digits as its factorization.

1423805749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 1423805749 is about 37733.3506198429. The cubic root of 1423805749 is about 1124.9941067016.

The spelling of 1423805749 in words is "one billion, four hundred twenty-three million, eight hundred five thousand, seven hundred forty-nine".