1990049 has 4 divisors (see below), whose sum is σ = 1993236. Its totient is φ = 1986864.

The previous prime is 1990039. The next prime is 1990069. The reversal of 1990049 is 9400991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9400991 = 19 ⋅494789.

It can be written as a sum of positive squares in 2 ways, for example, as 351649 + 1638400 = 593^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990049 - 2⁴ = 1990033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1989997 and 1990024.

It is not an unprimeable number, because it can be changed into a prime (1990039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314 + ... + 2019.

It is an arithmetic number, because the mean of its divisors is an integer number (498309).

2^1990049 is an apocalyptic number.

It is an amenable number.

1990049 is a deficient number, since it is larger than the sum of its proper divisors (3187).

1990049 is an equidigital number, since it uses as much as digits as its factorization.

1990049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3186.

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

The square root of 1990049 is about 1410.6909654492. The cubic root of 1990049 is about 125.7827995655.

The spelling of 1990049 in words is "one million, nine hundred ninety thousand, forty-nine".