139243518 has 48 divisors (see below), whose sum is σ = 316102176. Its totient is φ = 44214720.

The previous prime is 139243513. The next prime is 139243553. The reversal of 139243518 is 815342931.

139243518 is a `hidden beast` number, since 13 + 92 + 43 + 518 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139243513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 130708 + ... + 131768.

It is an arithmetic number, because the mean of its divisors is an integer number (6585462).

Almost surely, 2^139243518 is an apocalyptic number.

139243518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 139243518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158051088).

139243518 is an abundant number, since it is smaller than the sum of its proper divisors (176858658).

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

139243518 is a wasteful number, since it uses less digits than its factorization.

139243518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409 (or 1406 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 139243518 is about 11800.1490668550. The cubic root of 139243518 is about 518.3124757572.

The spelling of 139243518 in words is "one hundred thirty-nine million, two hundred forty-three thousand, five hundred eighteen".