1663893 has 36 divisors (see below), whose sum is σ = 3058848. Its totient is φ = 864360.

The previous prime is 1663891. The next prime is 1663913. The reversal of 1663893 is 3983661.

It is a happy number.

1663893 is a `hidden beast` number, since 16 + 638 + 9 + 3 = 666.

It is not a de Polignac number, because 1663893 - 2¹ = 1663891 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663891) 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 35 ways as a sum of consecutive naturals, for example, 151258 + ... + 151268.

It is an arithmetic number, because the mean of its divisors is an integer number (84968).

2^1663893 is an apocalyptic number.

It is an amenable number.

1663893 is a deficient number, since it is larger than the sum of its proper divisors (1394955).

1663893 is an frugal number, since it uses more digits than its factorization.

1663893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52 (or 21 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 1663893 is about 1289.9197649466. The cubic root of 1663893 is about 118.4973027213.

It can be divided in two parts, 1663 and 893, that added together give a triangular number (2556 = T₇₁).

The spelling of 1663893 in words is "one million, six hundred sixty-three thousand, eight hundred ninety-three".