139542018 has 128 divisors (see below), whose sum is σ = 374077440. Its totient is φ = 33592320.

The previous prime is 139541999. The next prime is 139542041. The reversal of 139542018 is 810245931.

139542018 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a self number, because there is not a number n which added to its sum of digits gives 139542018.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 856005 + ... + 856167.

It is an arithmetic number, because the mean of its divisors is an integer number (2922480).

Almost surely, 2^139542018 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139542018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187038720).

139542018 is an abundant number, since it is smaller than the sum of its proper divisors (234535422).

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

139542018 is a wasteful number, since it uses less digits than its factorization.

139542018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 139542018 is about 11812.7904408738. The cubic root of 139542018 is about 518.6825847846.

Adding to 139542018 its reverse (810245931), we get a palindrome (949787949).

The spelling of 139542018 in words is "one hundred thirty-nine million, five hundred forty-two thousand, eighteen".