139218518 has 8 divisors (see below), whose sum is σ = 208964448. Its totient is φ = 69563704.

The previous prime is 139218511. The next prime is 139218539. The reversal of 139218518 is 815812931.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139218511) 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, 18821 + ... + 25152.

It is an arithmetic number, because the mean of its divisors is an integer number (26120556).

Almost surely, 2^139218518 is an apocalyptic number.

139218518 is a deficient number, since it is larger than the sum of its proper divisors (69745930).

139218518 is a wasteful number, since it uses less digits than its factorization.

139218518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45558.

The product of its digits is 17280, while the sum is 38.

The square root of 139218518 is about 11799.0897106514. The cubic root of 139218518 is about 518.2814543552.

The spelling of 139218518 in words is "one hundred thirty-nine million, two hundred eighteen thousand, five hundred eighteen".