1726989 has 16 divisors (see below), whose sum is σ = 2557440. Its totient is φ = 1027760.

The previous prime is 1726969. The next prime is 1726993. The reversal of 1726989 is 9896271.

It is a cyclic number.

It is not a de Polignac number, because 1726989 - 2⁵ = 1726957 is a prime.

It is a super-2 number, since 2×1726989² = 5964982012242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1726989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1726919) 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, 1504 + ... + 2390.

It is an arithmetic number, because the mean of its divisors is an integer number (159840).

2^1726989 is an apocalyptic number.

It is an amenable number.

1726989 is a deficient number, since it is larger than the sum of its proper divisors (830451).

1726989 is a wasteful number, since it uses less digits than its factorization.

1726989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960.

The product of its digits is 54432, while the sum is 42.

The square root of 1726989 is about 1314.1495348704. The cubic root of 1726989 is about 119.9765926567.

The spelling of 1726989 in words is "one million, seven hundred twenty-six thousand, nine hundred eighty-nine".