1808001 has 40 divisors (see below), whose sum is σ = 3110184. Its totient is φ = 1036800.

The previous prime is 1807999. The next prime is 1808003. The reversal of 1808001 is 1008081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1807999) and next prime (1808003).

It can be written as a sum of positive squares in 4 ways, for example, as 641601 + 1166400 = 801^2 + 1080^2 .

It is not a de Polignac number, because 1808001 - 2¹ = 1807999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1808003) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 17851 + ... + 17951.

2^1808001 is an apocalyptic number.

It is an amenable number.

1808001 is a deficient number, since it is larger than the sum of its proper divisors (1302183).

1808001 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (1808000) it forms an eRAP, since the sums of their prime factors are consecutive (142 and 143).

1808001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 1808001 is about 1344.6192769703. The cubic root of 1808001 is about 121.8240094386.

The spelling of 1808001 in words is "one million, eight hundred eight thousand, one".