289643638 has 8 divisors (see below), whose sum is σ = 457332120. Its totient is φ = 137199600.

The previous prime is 289643609. The next prime is 289643687. The reversal of 289643638 is 836346982.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 289643591 and 289643600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3811063 + ... + 3811138.

It is an arithmetic number, because the mean of its divisors is an integer number (57166515).

Almost surely, 2^289643638 is an apocalyptic number.

289643638 is a deficient number, since it is larger than the sum of its proper divisors (167688482).

289643638 is a wasteful number, since it uses less digits than its factorization.

289643638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7622222.

The product of its digits is 1492992, while the sum is 49.

The square root of 289643638 is about 17018.9200009871. The cubic root of 289643638 is about 661.6393574825.

The spelling of 289643638 in words is "two hundred eighty-nine million, six hundred forty-three thousand, six hundred thirty-eight".