1806423149 has 2 divisors, whose sum is σ = 1806423150. Its totient is φ = 1806423148.

The previous prime is 1806423131. The next prime is 1806423169. The reversal of 1806423149 is 9413246081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1411129225 + 395293924 = 37565^2 + 19882^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1806423149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1806423169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 903211574 + 903211575.

It is an arithmetic number, because the mean of its divisors is an integer number (903211575).

Almost surely, 2^1806423149 is an apocalyptic number.

It is an amenable number.

1806423149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1806423149 is an equidigital number, since it uses as much as digits as its factorization.

1806423149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 1806423149 is about 42502.0369982428. The cubic root of 1806423149 is about 1217.8856032849.

The spelling of 1806423149 in words is "one billion, eight hundred six million, four hundred twenty-three thousand, one hundred forty-nine".