139522518 has 12 divisors (see below), whose sum is σ = 302298828. Its totient is φ = 46507500.

The previous prime is 139522517. The next prime is 139522571. The reversal of 139522518 is 815225931.

139522518 is a `hidden beast` number, since 139 + 5 + 2 + 2 + 518 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139522517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3875608 + ... + 3875643.

It is an arithmetic number, because the mean of its divisors is an integer number (25191569).

Almost surely, 2^139522518 is an apocalyptic number.

139522518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

139522518 is an abundant number, since it is smaller than the sum of its proper divisors (162776310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139522518 is a wasteful number, since it uses less digits than its factorization.

139522518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7751259 (or 7751256 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 139522518 is about 11811.9650355053. The cubic root of 139522518 is about 518.6584229306.

The spelling of 139522518 in words is "one hundred thirty-nine million, five hundred twenty-two thousand, five hundred eighteen".