139218289 has 8 divisors (see below), whose sum is σ = 160360448. Its totient is φ = 118389600.

The previous prime is 139218281. The next prime is 139218293. The reversal of 139218289 is 982812931.

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

It is not a de Polignac number, because 139218289 - 2³ = 139218281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139218281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77412 + ... + 79189.

It is an arithmetic number, because the mean of its divisors is an integer number (20045056).

Almost surely, 2^139218289 is an apocalyptic number.

It is an amenable number.

139218289 is a deficient number, since it is larger than the sum of its proper divisors (21142159).

139218289 is a wasteful number, since it uses less digits than its factorization.

139218289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156735.

The product of its digits is 62208, while the sum is 43.

The square root of 139218289 is about 11799.0800065090. The cubic root of 139218289 is about 518.2811701819.

The spelling of 139218289 in words is "one hundred thirty-nine million, two hundred eighteen thousand, two hundred eighty-nine".