1820523 has 18 divisors (see below), whose sum is σ = 2625852. Its totient is φ = 1121760.

The previous prime is 1820521. The next prime is 1820527. The reversal of 1820523 is 3250281.

It is not a de Polignac number, because 1820523 - 2¹ = 1820521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1820523.

It is not an unprimeable number, because it can be changed into a prime (1820521) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 44383 + ... + 44423.

2^1820523 is an apocalyptic number.

1820523 is a deficient number, since it is larger than the sum of its proper divisors (805329).

1820523 is an equidigital number, since it uses as much as digits as its factorization.

1820523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1820523 is about 1349.2675790962. The cubic root of 1820523 is about 122.1046088353.

The spelling of 1820523 in words is "one million, eight hundred twenty thousand, five hundred twenty-three".