1607989 has 4 divisors (see below), whose sum is σ = 1692640. Its totient is φ = 1523340.

The previous prime is 1607987. The next prime is 1608007. The reversal of 1607989 is 9897061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1607989 - 2¹ = 1607987 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 (1607981) 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, 42297 + ... + 42334.

It is an arithmetic number, because the mean of its divisors is an integer number (423160).

2^1607989 is an apocalyptic number.

1607989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1607989 is a deficient number, since it is larger than the sum of its proper divisors (84651).

1607989 is an equidigital number, since it uses as much as digits as its factorization.

1607989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84650.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 1607989 is about 1268.0650614223. The cubic root of 1607989 is about 117.1550529072.

The spelling of 1607989 in words is "one million, six hundred seven thousand, nine hundred eighty-nine".