1663849 has 12 divisors (see below), whose sum is σ = 1920240. Its totient is φ = 1429560.

The previous prime is 1663813. The next prime is 1663861. The reversal of 1663849 is 9483661.

It is not a de Polignac number, because 1663849 - 2⁷ = 1663721 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3762 + ... + 4180.

It is an arithmetic number, because the mean of its divisors is an integer number (160020).

2^1663849 is an apocalyptic number.

1663849 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1663849 is a deficient number, since it is larger than the sum of its proper divisors (256391).

1663849 is a wasteful number, since it uses less digits than its factorization.

1663849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468 (or 449 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 1663849 is about 1289.9027095095. The cubic root of 1663849 is about 118.4962581975.

The spelling of 1663849 in words is "one million, six hundred sixty-three thousand, eight hundred forty-nine".