1803681 has 16 divisors (see below), whose sum is σ = 2915520. Its totient is φ = 1092960.

The previous prime is 1803679. The next prime is 1803691. The reversal of 1803681 is 1863081.

It is not a de Polignac number, because 1803681 - 2¹ = 1803679 is a prime.

It is a super-2 number, since 2×1803681² = 6506530299522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1803671) 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, 2740 + ... + 3333.

It is an arithmetic number, because the mean of its divisors is an integer number (182220).

2^1803681 is an apocalyptic number.

1803681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1803681 is a deficient number, since it is larger than the sum of its proper divisors (1111839).

1803681 is a wasteful number, since it uses less digits than its factorization.

1803681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6093 (or 6087 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1803681 is about 1343.0119135734. The cubic root of 1803681 is about 121.7269041385.

The spelling of 1803681 in words is "one million, eight hundred three thousand, six hundred eighty-one".