1781025 has 12 divisors (see below), whose sum is σ = 2944752. Its totient is φ = 949840.

The previous prime is 1781009. The next prime is 1781027. The reversal of 1781025 is 5201871.

It is not a de Polignac number, because 1781025 - 2⁴ = 1781009 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1780986 and 1781004.

It is not an unprimeable number, because it can be changed into a prime (1781027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11799 + ... + 11948.

It is an arithmetic number, because the mean of its divisors is an integer number (245396).

2^1781025 is an apocalyptic number.

1781025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1781025 is a deficient number, since it is larger than the sum of its proper divisors (1163727).

1781025 is a wasteful number, since it uses less digits than its factorization.

1781025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23760 (or 23755 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 24.

The square root of 1781025 is about 1334.5504861188. The cubic root of 1781025 is about 121.2150854231.

Adding to 1781025 its reverse (5201871), we get a palindrome (6982896).

The spelling of 1781025 in words is "one million, seven hundred eighty-one thousand, twenty-five".