1606389 has 16 divisors (see below), whose sum is σ = 2310144. Its totient is φ = 990000.

The previous prime is 1606387. The next prime is 1606399. The reversal of 1606389 is 9836061.

It is not a de Polignac number, because 1606389 - 2¹ = 1606387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1764 + ... + 2514.

It is an arithmetic number, because the mean of its divisors is an integer number (144384).

2^1606389 is an apocalyptic number.

It is an amenable number.

1606389 is a deficient number, since it is larger than the sum of its proper divisors (703755).

1606389 is a wasteful number, since it uses less digits than its factorization.

1606389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 1606389 is about 1267.4340219514. The cubic root of 1606389 is about 117.1161823487.

The spelling of 1606389 in words is "one million, six hundred six thousand, three hundred eighty-nine".