1662887 has 4 divisors (see below), whose sum is σ = 1678536. Its totient is φ = 1647240.

The previous prime is 1662883. The next prime is 1662893. The reversal of 1662887 is 7882661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1662887 - 2² = 1662883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1662887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7664 + ... + 7877.

It is an arithmetic number, because the mean of its divisors is an integer number (419634).

2^1662887 is an apocalyptic number.

1662887 is a deficient number, since it is larger than the sum of its proper divisors (15649).

1662887 is a wasteful number, since it uses less digits than its factorization.

1662887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15648.

The product of its digits is 32256, while the sum is 38.

The square root of 1662887 is about 1289.5297592533. The cubic root of 1662887 is about 118.4734165060.

The spelling of 1662887 in words is "one million, six hundred sixty-two thousand, eight hundred eighty-seven".