1649825 has 6 divisors (see below), whose sum is σ = 2045814. Its totient is φ = 1319840.

The previous prime is 1649819. The next prime is 1649831. The reversal of 1649825 is 5289461.

It is an interprime number because it is at equal distance from previous prime (1649819) and next prime (1649831).

It can be written as a sum of positive squares in 3 ways, for example, as 226576 + 1423249 = 476^2 + 1193^2 .

It is not a de Polignac number, because 1649825 - 2¹² = 1645729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32972 + ... + 33021.

It is an arithmetic number, because the mean of its divisors is an integer number (340969).

2^1649825 is an apocalyptic number.

It is an amenable number.

1649825 is a deficient number, since it is larger than the sum of its proper divisors (395989).

1649825 is an equidigital number, since it uses as much as digits as its factorization.

1649825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66003 (or 65998 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

The square root of 1649825 is about 1284.4551374026. The cubic root of 1649825 is about 118.1623972929.

It can be divided in two parts, 1649 and 825, that multiplied together give a triangular number (1360425 = T₁₆₄₉).

The spelling of 1649825 in words is "one million, six hundred forty-nine thousand, eight hundred twenty-five".