1649425 has 12 divisors (see below), whose sum is σ = 2166156. Its totient is φ = 1241600.

The previous prime is 1649419. The next prime is 1649429. The reversal of 1649425 is 5249461.

It can be written as a sum of positive squares in 6 ways, for example, as 8464 + 1640961 = 92^2 + 1281^2 .

It is not a de Polignac number, because 1649425 - 2⁵ = 1649393 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1649429) 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, 1516 + ... + 2365.

It is an arithmetic number, because the mean of its divisors is an integer number (180513).

2^1649425 is an apocalyptic number.

It is an amenable number.

1649425 is a deficient number, since it is larger than the sum of its proper divisors (516731).

1649425 is a wasteful number, since it uses less digits than its factorization.

1649425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3908 (or 3903 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 1649425 is about 1284.2994199173. The cubic root of 1649425 is about 118.1528470316.

The spelling of 1649425 in words is "one million, six hundred forty-nine thousand, four hundred twenty-five".