1345809 has 8 divisors (see below), whose sum is σ = 1802880. Its totient is φ = 892976.

The previous prime is 1345787. The next prime is 1345811. The reversal of 1345809 is 9085431.

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 1345809 - 2⁵ = 1345777 is a prime.

It is a super-2 number, since 2×1345809² = 3622403728962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1345859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222 + ... + 1655.

It is an arithmetic number, because the mean of its divisors is an integer number (225360).

2^1345809 is an apocalyptic number.

It is an amenable number.

1345809 is a deficient number, since it is larger than the sum of its proper divisors (457071).

1345809 is a wasteful number, since it uses less digits than its factorization.

1345809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2119.

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

The square root of 1345809 is about 1160.0900827091. The cubic root of 1345809 is about 110.4064576930.

The spelling of 1345809 in words is "one million, three hundred forty-five thousand, eight hundred nine".