1825220 has 24 divisors (see below), whose sum is σ = 3858624. Its totient is φ = 725216.

The previous prime is 1825217. The next prime is 1825261. The reversal of 1825220 is 225281.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1825192 and 1825201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5087 + ... + 5433.

It is an arithmetic number, because the mean of its divisors is an integer number (160776).

2^1825220 is an apocalyptic number.

1825220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1825220 is an abundant number, since it is smaller than the sum of its proper divisors (2033404).

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

1825220 is a wasteful number, since it uses less digits than its factorization.

1825220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619 (or 617 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1825220 is about 1351.0070318100. The cubic root of 1825220 is about 122.2095297502.

The spelling of 1825220 in words is "one million, eight hundred twenty-five thousand, two hundred twenty".