1478891 has 4 divisors (see below), whose sum is σ = 1501032. Its totient is φ = 1456752.

The previous prime is 1478887. The next prime is 1478909. The reversal of 1478891 is 1988741.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1988741 = 23 ⋅86467.

It is a cyclic number.

It is not a de Polignac number, because 1478891 - 2² = 1478887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1478861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10970 + ... + 11103.

It is an arithmetic number, because the mean of its divisors is an integer number (375258).

2^1478891 is an apocalyptic number.

1478891 is a deficient number, since it is larger than the sum of its proper divisors (22141).

1478891 is an equidigital number, since it uses as much as digits as its factorization.

1478891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22140.

The product of its digits is 16128, while the sum is 38.

The square root of 1478891 is about 1216.0966244505. The cubic root of 1478891 is about 113.9319127641.

The spelling of 1478891 in words is "one million, four hundred seventy-eight thousand, eight hundred ninety-one".