5639989 has 2 divisors, whose sum is σ = 5639990. Its totient is φ = 5639988.

The previous prime is 5639983. The next prime is 5640031. The reversal of 5639989 is 9899365.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3359889 + 2280100 = 1833^2 + 1510^2 .

It is a cyclic number.

It is not a de Polignac number, because 5639989 - 2³ = 5639981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5639981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2819994 + 2819995.

It is an arithmetic number, because the mean of its divisors is an integer number (2819995).

Almost surely, 2^5639989 is an apocalyptic number.

It is an amenable number.

5639989 is a deficient number, since it is larger than the sum of its proper divisors (1).

5639989 is an equidigital number, since it uses as much as digits as its factorization.

5639989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 49.

The square root of 5639989 is about 2374.8661014887. The cubic root of 5639989 is about 178.0024933371.

The spelling of 5639989 in words is "five million, six hundred thirty-nine thousand, nine hundred eighty-nine".