1566489 has 8 divisors (see below), whose sum is σ = 2112480. Its totient is φ = 1032416.

The previous prime is 1566479. The next prime is 1566517. The reversal of 1566489 is 9846651.

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

It is a cyclic number.

It is not a de Polignac number, because 1566489 - 2¹⁷ = 1435417 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1566449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2667 + ... + 3200.

It is an arithmetic number, because the mean of its divisors is an integer number (264060).

2^1566489 is an apocalyptic number.

It is an amenable number.

1566489 is a deficient number, since it is larger than the sum of its proper divisors (545991).

1566489 is an equidigital number, since it uses as much as digits as its factorization.

1566489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5959.

The product of its digits is 51840, while the sum is 39.

The square root of 1566489 is about 1251.5945829221. The cubic root of 1566489 is about 116.1383851811.

It can be divided in two parts, 15664 and 89, that added together give a triangular number (15753 = T₁₇₇).

The spelling of 1566489 in words is "one million, five hundred sixty-six thousand, four hundred eighty-nine".