1820525 has 24 divisors (see below), whose sum is σ = 2630784. Its totient is φ = 1224000.

The previous prime is 1820521. The next prime is 1820527. The reversal of 1820525 is 5250281.

1820525 = 778² + 779² + 780².

It is not a de Polignac number, because 1820525 - 2² = 1820521 is a prime.

It is a super-2 number, since 2×1820525² = 6628622551250, which contains 22 as substring.

It is a Smith number, since the sum of its digits (23) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1820525.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 17624 + ... + 17726.

It is an arithmetic number, because the mean of its divisors is an integer number (109616).

2^1820525 is an apocalyptic number.

It is an amenable number.

1820525 is a deficient number, since it is larger than the sum of its proper divisors (810259).

1820525 is a wasteful number, since it uses less digits than its factorization.

1820525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 1820525 is about 1349.2683202388. The cubic root of 1820525 is about 122.1046535494.

The spelling of 1820525 in words is "one million, eight hundred twenty thousand, five hundred twenty-five".