289439639 has 4 divisors (see below), whose sum is σ = 292305480. Its totient is φ = 286573800.

The previous prime is 289439629. The next prime is 289439687. The reversal of 289439639 is 936934982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936934982 = 2 ⋅468467491.

It is a cyclic number.

It is not a de Polignac number, because 289439639 - 2¹² = 289435543 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 (289439629) 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, 1432769 + ... + 1432970.

It is an arithmetic number, because the mean of its divisors is an integer number (73076370).

Almost surely, 2^289439639 is an apocalyptic number.

289439639 is a deficient number, since it is larger than the sum of its proper divisors (2865841).

289439639 is a wasteful number, since it uses less digits than its factorization.

289439639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2865840.

The product of its digits is 2519424, while the sum is 53.

The square root of 289439639 is about 17012.9256449324. The cubic root of 289439639 is about 661.4839878607.

The spelling of 289439639 in words is "two hundred eighty-nine million, four hundred thirty-nine thousand, six hundred thirty-nine".