1990493 has 2 divisors, whose sum is σ = 1990494. Its totient is φ = 1990492.

The previous prime is 1990487. The next prime is 1990507. The reversal of 1990493 is 3940991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1026169 + 964324 = 1013^2 + 982^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990493 - 2⁸ = 1990237 is a prime.

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 (1990433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995246 + 995247.

It is an arithmetic number, because the mean of its divisors is an integer number (995247).

2^1990493 is an apocalyptic number.

It is an amenable number.

1990493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990493 is an equidigital number, since it uses as much as digits as its factorization.

1990493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 1990493 is about 1410.8483263625. The cubic root of 1990493 is about 125.7921533403.

The spelling of 1990493 in words is "one million, nine hundred ninety thousand, four hundred ninety-three".