1662989 has 4 divisors (see below), whose sum is σ = 1674300. Its totient is φ = 1651680.

The previous prime is 1662979. The next prime is 1663009. The reversal of 1662989 is 9892661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 100489 + 1562500 = 317^2 + 1250^2 .

It is a cyclic number.

It is not a de Polignac number, because 1662989 - 2⁸ = 1662733 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 (1662929) 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, 5432 + ... + 5729.

It is an arithmetic number, because the mean of its divisors is an integer number (418575).

2^1662989 is an apocalyptic number.

It is an amenable number.

1662989 is a deficient number, since it is larger than the sum of its proper divisors (11311).

1662989 is a wasteful number, since it uses less digits than its factorization.

1662989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11310.

The product of its digits is 46656, while the sum is 41.

The square root of 1662989 is about 1289.5693079474. The cubic root of 1662989 is about 118.4758388076.

The spelling of 1662989 in words is "one million, six hundred sixty-two thousand, nine hundred eighty-nine".