1806682021 has 16 divisors (see below), whose sum is σ = 1962040320. Its totient is φ = 1657089280.

The previous prime is 1806681997. The next prime is 1806682063. The reversal of 1806682021 is 1202866081.

It is not a de Polignac number, because 1806682021 - 2¹³ = 1806673829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1806682091) 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, 186231 + ... + 195691.

It is an arithmetic number, because the mean of its divisors is an integer number (122627520).

Almost surely, 2^1806682021 is an apocalyptic number.

It is an amenable number.

1806682021 is a deficient number, since it is larger than the sum of its proper divisors (155358299).

1806682021 is a wasteful number, since it uses less digits than its factorization.

1806682021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9764.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 1806682021 is about 42505.0822961208. The cubic root of 1806682021 is about 1217.9437774403.

The spelling of 1806682021 in words is "one billion, eight hundred six million, six hundred eighty-two thousand, twenty-one".