613989 has 12 divisors (see below), whose sum is σ = 939276. Its totient is φ = 385152.

The previous prime is 613981. The next prime is 613993. The reversal of 613989 is 989316.

It can be written as a sum of positive squares in 2 ways, for example, as 497025 + 116964 = 705^2 + 342^2 .

It is not a de Polignac number, because 613989 - 2³ = 613981 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (613981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1854 + ... + 2159.

It is an arithmetic number, because the mean of its divisors is an integer number (78273).

2⁶¹³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

613989 is a deficient number, since it is larger than the sum of its proper divisors (325287).

613989 is a wasteful number, since it uses less digits than its factorization.

613989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4036 (or 4033 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 613989 is about 783.5745018822. The cubic root of 613989 is about 84.9937250270.

The spelling of 613989 in words is "six hundred thirteen thousand, nine hundred eighty-nine".