1803081 has 16 divisors (see below), whose sum is σ = 2892800. Its totient is φ = 975888.

The previous prime is 1803079. The next prime is 1803089.

It is a happy number.

1803081 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1803081 - 2¹ = 1803079 is a prime.

It is a super-2 number, since 2×1803081² = 6502202185122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1803089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1861 + ... + 2658.

It is an arithmetic number, because the mean of its divisors is an integer number (180800).

2^1803081 is an apocalyptic number.

It is an amenable number.

1803081 is a deficient number, since it is larger than the sum of its proper divisors (1089719).

1803081 is a wasteful number, since it uses less digits than its factorization.

1803081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4548.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 1803081 is about 1342.7885164835. The cubic root of 1803081 is about 121.7134050326.

The spelling of 1803081 in words is "one million, eight hundred three thousand, eighty-one".