1821523 has 8 divisors (see below), whose sum is σ = 2033856. Its totient is φ = 1617000.

The previous prime is 1821509. The next prime is 1821541. The reversal of 1821523 is 3251281.

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

It is a de Polignac number, because none of the positive numbers 2^k-1821523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1821494 and 1821503.

It is not an unprimeable number, because it can be changed into a prime (1821553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1453 + ... + 2398.

It is an arithmetic number, because the mean of its divisors is an integer number (254232).

2^1821523 is an apocalyptic number.

1821523 is a deficient number, since it is larger than the sum of its proper divisors (212333).

1821523 is a wasteful number, since it uses less digits than its factorization.

1821523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3905.

The product of its digits is 480, while the sum is 22.

The square root of 1821523 is about 1349.6380996400. The cubic root of 1821523 is about 122.1269617999.

The spelling of 1821523 in words is "one million, eight hundred twenty-one thousand, five hundred twenty-three".