1491843 has 4 divisors (see below), whose sum is σ = 1989128. Its totient is φ = 994560.

The previous prime is 1491839. The next prime is 1491851. The reversal of 1491843 is 3481941.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1491843 - 2² = 1491839 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1491843.

It is not an unprimeable number, because it can be changed into a prime (1491863) 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, 248638 + ... + 248643.

It is an arithmetic number, because the mean of its divisors is an integer number (497282).

2^1491843 is an apocalyptic number.

1491843 is a deficient number, since it is larger than the sum of its proper divisors (497285).

1491843 is an equidigital number, since it uses as much as digits as its factorization.

1491843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497284.

The product of its digits is 3456, while the sum is 30.

The square root of 1491843 is about 1221.4102504892. The cubic root of 1491843 is about 114.2635484542.

The spelling of 1491843 in words is "one million, four hundred ninety-one thousand, eight hundred forty-three".