1813021 has 8 divisors (see below), whose sum is σ = 2162304. Its totient is φ = 1486320.

The previous prime is 1813003. The next prime is 1813039. The reversal of 1813021 is 1203181.

It is an interprime number because it is at equal distance from previous prime (1813003) and next prime (1813039).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1813021 - 2⁵ = 1812989 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1812986 and 1813004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5470 + ... + 5791.

It is an arithmetic number, because the mean of its divisors is an integer number (270288).

2^1813021 is an apocalyptic number.

It is an amenable number.

1813021 is a deficient number, since it is larger than the sum of its proper divisors (349283).

1813021 is a wasteful number, since it uses less digits than its factorization.

1813021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11291.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1813021 is about 1346.4846824231. The cubic root of 1813021 is about 121.9366552822.

The spelling of 1813021 in words is "one million, eight hundred thirteen thousand, twenty-one".