1809345 has 8 divisors (see below), whose sum is σ = 2894976. Its totient is φ = 964976.

The previous prime is 1809331. The next prime is 1809349. The reversal of 1809345 is 5439081.

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 1809345 - 2⁷ = 1809217 is a prime.

1809345 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1809349) 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, 60297 + ... + 60326.

It is an arithmetic number, because the mean of its divisors is an integer number (361872).

2^1809345 is an apocalyptic number.

1809345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1809345 is a deficient number, since it is larger than the sum of its proper divisors (1085631).

1809345 is a wasteful number, since it uses less digits than its factorization.

1809345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120631.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1809345 is about 1345.1189538476. The cubic root of 1809345 is about 121.8541884253.

The spelling of 1809345 in words is "one million, eight hundred nine thousand, three hundred forty-five".