618889 has 4 divisors (see below), whose sum is σ = 640260. Its totient is φ = 597520.

The previous prime is 618883. The next prime is 618913. The reversal of 618889 is 988816.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 518400 + 100489 = 720^2 + 317^2 .

It is a cyclic number.

It is not a de Polignac number, because 618889 - 2⁵ = 618857 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (618883) 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, 10642 + ... + 10699.

It is an arithmetic number, because the mean of its divisors is an integer number (160065).

2⁶¹⁸⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

618889 is a deficient number, since it is larger than the sum of its proper divisors (21371).

618889 is a wasteful number, since it uses less digits than its factorization.

618889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21370.

The product of its digits is 27648, while the sum is 40.

The square root of 618889 is about 786.6949853660. The cubic root of 618889 is about 85.2192264867.

The spelling of 618889 in words is "six hundred eighteen thousand, eight hundred eighty-nine".