1990829 has 2 divisors, whose sum is σ = 1990830. Its totient is φ = 1990828.

The previous prime is 1990823. The next prime is 1990831. The reversal of 1990829 is 9280991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1177225 + 813604 = 1085^2 + 902^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990829 - 2¹⁶ = 1925293 is a prime.

Together with 1990831, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1990792 and 1990801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995414 + 995415.

It is an arithmetic number, because the mean of its divisors is an integer number (995415).

2^1990829 is an apocalyptic number.

It is an amenable number.

1990829 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990829 is an equidigital number, since it uses as much as digits as its factorization.

1990829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 1990829 is about 1410.9673986312. The cubic root of 1990829 is about 125.7992309479.

The spelling of 1990829 in words is "one million, nine hundred ninety thousand, eight hundred twenty-nine".