1663887 has 8 divisors (see below), whose sum is σ = 2335360. Its totient is φ = 1050840.

The previous prime is 1663877. The next prime is 1663891. The reversal of 1663887 is 7883661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1663887 - 2¹⁰ = 1662863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14539 + ... + 14652.

It is an arithmetic number, because the mean of its divisors is an integer number (291920).

2^1663887 is an apocalyptic number.

1663887 is a deficient number, since it is larger than the sum of its proper divisors (671473).

1663887 is a wasteful number, since it uses less digits than its factorization.

1663887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29213.

The product of its digits is 48384, while the sum is 39.

The square root of 1663887 is about 1289.9174392185. The cubic root of 1663887 is about 118.4971602873.

Subtracting from 1663887 its product of digits (48384), we obtain a triangular number (1615503 = T₁₇₉₇).

It can be divided in two parts, 16 and 63887, that added together give a triangular number (63903 = T₃₅₇).

The spelling of 1663887 in words is "one million, six hundred sixty-three thousand, eight hundred eighty-seven".