1812825 has 36 divisors (see below), whose sum is σ = 3714048. Its totient is φ = 828000.

The previous prime is 1812823. The next prime is 1812827. The reversal of 1812825 is 5282181.

1812825 = 246² + 247² + ... + 272².

It is an interprime number because it is at equal distance from previous prime (1812823) and next prime (1812827).

It is not a de Polignac number, because 1812825 - 2¹ = 1812823 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1812821) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1000 + ... + 2150.

It is an arithmetic number, because the mean of its divisors is an integer number (103168).

2^1812825 is an apocalyptic number.

1812825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1812825 is an abundant number, since it is smaller than the sum of its proper divisors (1901223).

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

1812825 is a wasteful number, since it uses less digits than its factorization.

1812825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174 (or 1166 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 1812825 is about 1346.4118983431. The cubic root of 1812825 is about 121.9322610610.

The spelling of 1812825 in words is "one million, eight hundred twelve thousand, eight hundred twenty-five".