1990491 has 16 divisors (see below), whose sum is σ = 2752800. Its totient is φ = 1278720.

The previous prime is 1990487. The next prime is 1990493. The reversal of 1990491 is 1940991.

It is not a de Polignac number, because 1990491 - 2² = 1990487 is a prime.

1990491 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1990493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13285 + ... + 13433.

It is an arithmetic number, because the mean of its divisors is an integer number (172050).

2^1990491 is an apocalyptic number.

1990491 is a deficient number, since it is larger than the sum of its proper divisors (762309).

1990491 is a wasteful number, since it uses less digits than its factorization.

1990491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 1990491 is about 1410.8476175690. The cubic root of 1990491 is about 125.7921112093.

The spelling of 1990491 in words is "one million, nine hundred ninety thousand, four hundred ninety-one".