1812545 has 8 divisors (see below), whose sum is σ = 2485824. Its totient is φ = 1242864.

The previous prime is 1812541. The next prime is 1812553. The reversal of 1812545 is 5452181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1812545 - 2² = 1812541 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1812541) 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, 25859 + ... + 25928.

It is an arithmetic number, because the mean of its divisors is an integer number (310728).

2^1812545 is an apocalyptic number.

It is an amenable number.

1812545 is a deficient number, since it is larger than the sum of its proper divisors (673279).

1812545 is an equidigital number, since it uses as much as digits as its factorization.

1812545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51799.

The product of its digits is 1600, while the sum is 26.

The square root of 1812545 is about 1346.3079142603. The cubic root of 1812545 is about 121.9259830528.

The spelling of 1812545 in words is "one million, eight hundred twelve thousand, five hundred forty-five".