1660725 has 54 divisors (see below), whose sum is σ = 3323138.
Its totient is φ = 792000.
The previous prime is 1660723. The next prime is 1660727. The reversal of 1660725 is 5270661.
1660725 is nontrivially palindromic in base 14.
It is an interprime number because it is at equal distance from previous prime (1660723) and next prime (1660727).
It can be written as a sum of positive squares in 3 ways, for example, as 4356 + 1656369 = 66^2 + 1287^2
It is not a de Polignac number, because 1660725 - 21 = 1660723 is a prime.
It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1660721) by changing a digit.
It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 27195 + ... + 27255.
21660725 is an apocalyptic number.
1660725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.
It is an amenable number.
1660725 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.
1660725 is a wasteful number, since it uses less digits than its factorization.
1660725 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 99 (or 80 counting only the distinct ones).
The product of its (nonzero) digits is 2520, while the sum is 27.
The square root of 1660725 is about 1288.6911965246.
The cubic root of 1660725 is about 118.4220498941.
The spelling of 1660725 in words is "one million, six hundred sixty thousand, seven hundred twenty-five".