139918289 has 8 divisors (see below), whose sum is σ = 160206528. Its totient is φ = 119705040.

The previous prime is 139918277. The next prime is 139918333. The reversal of 139918289 is 982819931.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-139918289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139918189) 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, 14687 + ... + 22260.

It is an arithmetic number, because the mean of its divisors is an integer number (20025816).

Almost surely, 2^139918289 is an apocalyptic number.

It is an amenable number.

139918289 is a deficient number, since it is larger than the sum of its proper divisors (20288239).

139918289 is an equidigital number, since it uses as much as digits as its factorization.

139918289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37495.

The product of its digits is 279936, while the sum is 50.

The square root of 139918289 is about 11828.7061422626. The cubic root of 139918289 is about 519.1483705525.

The spelling of 139918289 in words is "one hundred thirty-nine million, nine hundred eighteen thousand, two hundred eighty-nine".