1991486 has 16 divisors (see below), whose sum is σ = 3473280. Its totient is φ = 838680.

The previous prime is 1991477. The next prime is 1991489. The reversal of 1991486 is 6841991.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1991489) 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 in 7 ways as a sum of consecutive naturals, for example, 380 + ... + 2031.

It is an arithmetic number, because the mean of its divisors is an integer number (217080).

2^1991486 is an apocalyptic number.

1991486 is a deficient number, since it is larger than the sum of its proper divisors (1481794).

1991486 is a wasteful number, since it uses less digits than its factorization.

1991486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2479.

The product of its digits is 15552, while the sum is 38.

The square root of 1991486 is about 1411.2001984127. The cubic root of 1991486 is about 125.8130678980.

The spelling of 1991486 in words is "one million, nine hundred ninety-one thousand, four hundred eighty-six".