1725649 has 4 divisors (see below), whose sum is σ = 1767780. Its totient is φ = 1683520.

The previous prime is 1725641. The next prime is 1725671. The reversal of 1725649 is 9465271.

1725649 = 52² + 53² + ... + 174².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 986049 + 739600 = 993^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 1725649 - 2³ = 1725641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1725641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21004 + ... + 21085.

It is an arithmetic number, because the mean of its divisors is an integer number (441945).

2^1725649 is an apocalyptic number.

It is an amenable number.

1725649 is a deficient number, since it is larger than the sum of its proper divisors (42131).

1725649 is an equidigital number, since it uses as much as digits as its factorization.

1725649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42130.

The product of its digits is 15120, while the sum is 34.

The square root of 1725649 is about 1313.6396004993. The cubic root of 1725649 is about 119.9455540044.

The spelling of 1725649 in words is "one million, seven hundred twenty-five thousand, six hundred forty-nine".