1649985 has 16 divisors (see below), whose sum is σ = 2655936. Its totient is φ = 874688.

The previous prime is 1649981. The next prime is 1649987. The reversal of 1649985 is 5899461.

It is a cyclic number.

It is not a de Polignac number, because 1649985 - 2² = 1649981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4582 + ... + 4928.

It is an arithmetic number, because the mean of its divisors is an integer number (165996).

2^1649985 is an apocalyptic number.

1649985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1649985 is a deficient number, since it is larger than the sum of its proper divisors (1005951).

1649985 is a wasteful number, since it uses less digits than its factorization.

1649985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672.

The product of its digits is 77760, while the sum is 42.

The square root of 1649985 is about 1284.5174191112. The cubic root of 1649985 is about 118.1662169651.

The spelling of 1649985 in words is "one million, six hundred forty-nine thousand, nine hundred eighty-five".