1781325 has 96 divisors (see below), whose sum is σ = 4166400. Its totient is φ = 725760.

The previous prime is 1781321. The next prime is 1781341. The reversal of 1781325 is 5231871.

It is not a de Polignac number, because 1781325 - 2² = 1781321 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1781321) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 61411 + ... + 61439.

It is an arithmetic number, because the mean of its divisors is an integer number (43400).

2^1781325 is an apocalyptic number.

1781325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1781325 is an abundant number, since it is smaller than the sum of its proper divisors (2385075).

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

1781325 is a wasteful number, since it uses less digits than its factorization.

1781325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68 (or 57 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 1781325 is about 1334.6628787825. The cubic root of 1781325 is about 121.2218909581.

The spelling of 1781325 in words is "one million, seven hundred eighty-one thousand, three hundred twenty-five".