1990229 has 2 divisors, whose sum is σ = 1990230. Its totient is φ = 1990228.

The previous prime is 1990223. The next prime is 1990237. The reversal of 1990229 is 9220991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1435204 + 555025 = 1198^2 + 745^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990229 - 2⁸ = 1989973 is a prime.

It is a super-2 number, since 2×1990229² = 7922022944882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1990195 and 1990204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990223) 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, 995114 + 995115.

It is an arithmetic number, because the mean of its divisors is an integer number (995115).

2^1990229 is an apocalyptic number.

It is an amenable number.

1990229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990229 is an equidigital number, since it uses as much as digits as its factorization.

1990229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 1990229 is about 1410.7547625296. The cubic root of 1990229 is about 125.7865918041.

The spelling of 1990229 in words is "one million, nine hundred ninety thousand, two hundred twenty-nine".