1663884 has 18 divisors (see below), whose sum is σ = 4206020. Its totient is φ = 554616.

The previous prime is 1663877. The next prime is 1663891. The reversal of 1663884 is 4883661.

It is a happy number.

1663884 is a `hidden beast` number, since 16 + 638 + 8 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (1663877) and next prime (1663891).

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 46219 = 1663884 / (1 + 6 + 6 + 3 + 8 + 8 + 4).

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, 23074 + ... + 23145.

2^1663884 is an apocalyptic number.

It is an amenable number.

1663884 is an abundant number, since it is smaller than the sum of its proper divisors (2542136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1663884 is a wasteful number, since it uses less digits than its factorization.

1663884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46229 (or 46224 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 1663884 is about 1289.9162763528. The cubic root of 1663884 is about 118.4970890702.

The spelling of 1663884 in words is "one million, six hundred sixty-three thousand, eight hundred eighty-four".