139725218 has 8 divisors (see below), whose sum is σ = 211663260. Its totient is φ = 69170800.

The previous prime is 139725211. The next prime is 139725233. The reversal of 139725218 is 812527931.

It can be written as a sum of positive squares in 2 ways, for example, as 92294449 + 47430769 = 9607^2 + 6887^2 .

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

It is not an unprimeable number, because it can be changed into a prime (139725211) 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, 345653 + ... + 346056.

Almost surely, 2^139725218 is an apocalyptic number.

139725218 is a deficient number, since it is larger than the sum of its proper divisors (71938042).

139725218 is a wasteful number, since it uses less digits than its factorization.

139725218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691812.

The product of its digits is 30240, while the sum is 38.

The square root of 139725218 is about 11820.5422041461. The cubic root of 139725218 is about 518.9094724685.

The spelling of 139725218 in words is "one hundred thirty-nine million, seven hundred twenty-five thousand, two hundred eighteen".