1805013 has 18 divisors (see below), whose sum is σ = 3033654. Its totient is φ = 1031184.

The previous prime is 1805003. The next prime is 1805039. The reversal of 1805013 is 3105081.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1483524 + 321489 = 1218^2 + 567^2 .

It is not a de Polignac number, because 1805013 - 2⁴ = 1804997 is a prime.

1805013 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1805003) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1606 + ... + 2487.

2^1805013 is an apocalyptic number.

It is an amenable number.

1805013 is a deficient number, since it is larger than the sum of its proper divisors (1228641).

1805013 is a wasteful number, since it uses less digits than its factorization.

1805013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4113 (or 4103 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1805013 is about 1343.5077223448. The cubic root of 1805013 is about 121.7568614572.

The spelling of 1805013 in words is "one million, eight hundred five thousand, thirteen".