1808971 has 6 divisors (see below), whose sum is σ = 1909572. Its totient is φ = 1713420.

The previous prime is 1808969. The next prime is 1808977. The reversal of 1808971 is 1798081.

It is not a de Polignac number, because 1808971 - 2¹ = 1808969 is a prime.

It is a Duffinian number.

1808971 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1808977) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2145 + ... + 2866.

It is an arithmetic number, because the mean of its divisors is an integer number (318262).

2^1808971 is an apocalyptic number.

1808971 is a deficient number, since it is larger than the sum of its proper divisors (100601).

1808971 is an equidigital number, since it uses as much as digits as its factorization.

1808971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5049 (or 5030 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 34.

The square root of 1808971 is about 1344.9799255007. The cubic root of 1808971 is about 121.8457919049.

The spelling of 1808971 in words is "one million, eight hundred eight thousand, nine hundred seventy-one".