1606646889 has 27 divisors (see below), whose sum is σ = 2403565437. Its totient is φ = 1034141400.

The previous prime is 1606646861. The next prime is 1606646911. The reversal of 1606646889 is 9886466061.

The square root of 1606646889 is 40083.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1606646889 - 2⁵ = 1606646857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1606646809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3727504 + ... + 3727934.

Almost surely, 2^1606646889 is an apocalyptic number.

1606646889 is the 40083-rd square number.

1606646889 is the 20042-nd centered octagonal number.

It is an amenable number.

1606646889 is a deficient number, since it is larger than the sum of its proper divisors (796918548).

1606646889 is an frugal number, since it uses more digits than its factorization.

1606646889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930 (or 465 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The cubic root of 1606646889 is about 1171.2244927391.

The spelling of 1606646889 in words is "one billion, six hundred six million, six hundred forty-six thousand, eight hundred eighty-nine".