1325820 has 48 divisors (see below), whose sum is σ = 3911040. Its totient is φ = 334656.

The previous prime is 1325803. The next prime is 1325861. The reversal of 1325820 is 285231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 559 + ... + 1721.

It is an arithmetic number, because the mean of its divisors is an integer number (81480).

2^1325820 is an apocalyptic number.

1325820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1325820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1955520).

1325820 is an abundant number, since it is smaller than the sum of its proper divisors (2585220).

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

1325820 is a wasteful number, since it uses less digits than its factorization.

1325820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194 (or 1192 counting only the distinct ones).

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

The square root of 1325820 is about 1151.4425734703. The cubic root of 1325820 is about 109.8571147541.

It can be divided in two parts, 1325 and 820, that added together give a triangular number (2145 = T₆₅).

The spelling of 1325820 in words is "one million, three hundred twenty-five thousand, eight hundred twenty".