1806345 has 24 divisors (see below), whose sum is σ = 3164616. Its totient is φ = 953088.

The previous prime is 1806341. The next prime is 1806347. The reversal of 1806345 is 5436081.

1806345 = T₈₉ + T₉₀ + ... + T₂₂₅.

It can be written as a sum of positive squares in 4 ways, for example, as 646416 + 1159929 = 804^2 + 1077^2 .

It is not a de Polignac number, because 1806345 - 2² = 1806341 is a prime.

1806345 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1806341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6019 + ... + 6311.

It is an arithmetic number, because the mean of its divisors is an integer number (131859).

2^1806345 is an apocalyptic number.

1806345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1806345 is a deficient number, since it is larger than the sum of its proper divisors (1358271).

1806345 is a wasteful number, since it uses less digits than its factorization.

1806345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441 (or 438 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1806345 is about 1344.0033482101. The cubic root of 1806345 is about 121.7868040417.

The spelling of 1806345 in words is "one million, eight hundred six thousand, three hundred forty-five".