1825820 has 12 divisors (see below), whose sum is σ = 3834264. Its totient is φ = 730320.

The previous prime is 1825819. The next prime is 1825829. The reversal of 1825820 is 285281.

It is a super-3 number, since 3×1825820³ = 18259762933324104000, which contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1825820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1825829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45626 + ... + 45665.

It is an arithmetic number, because the mean of its divisors is an integer number (319522).

2^1825820 is an apocalyptic number.

1825820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1825820 is an abundant number, since it is smaller than the sum of its proper divisors (2008444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1825820 is a wasteful number, since it uses less digits than its factorization.

1825820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91300 (or 91298 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 1825820 is about 1351.2290701432. The cubic root of 1825820 is about 122.2229194940. Note that the first 3 decimals are identical.

It can be divided in two parts, 182 and 5820, that multiplied together give a triangular number (1059240 = T₁₄₅₅).

The spelling of 1825820 in words is "one million, eight hundred twenty-five thousand, eight hundred twenty".