1822398989 has 2 divisors, whose sum is σ = 1822398990. Its totient is φ = 1822398988.

The previous prime is 1822398943. The next prime is 1822399001. The reversal of 1822398989 is 9898932281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1677557764 + 144841225 = 40958^2 + 12035^2 .

It is a cyclic number.

It is not a de Polignac number, because 1822398989 - 2²⁰ = 1821350413 is a prime.

It is a super-2 number, since 2×1822398989² = 6642276150216444242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1822098989) 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, 911199494 + 911199495.

It is an arithmetic number, because the mean of its divisors is an integer number (911199495).

Almost surely, 2^1822398989 is an apocalyptic number.

It is an amenable number.

1822398989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1822398989 is an equidigital number, since it uses as much as digits as its factorization.

1822398989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4478976, while the sum is 59.

The square root of 1822398989 is about 42689.5653409589. The cubic root of 1822398989 is about 1221.4653602987.

The spelling of 1822398989 in words is "one billion, eight hundred twenty-two million, three hundred ninety-eight thousand, nine hundred eighty-nine".