139018 has 16 divisors (see below), whose sum is σ = 233280. Its totient is φ = 61600.

The previous prime is 138977. The next prime is 139021. The reversal of 139018 is 810931.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a self number, because there is not a number n which added to its sum of digits gives 139018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1518 + ... + 1606.

It is an arithmetic number, because the mean of its divisors is an integer number (14580).

2¹³⁹⁰¹⁸ is an apocalyptic number.

139018 is a deficient number, since it is larger than the sum of its proper divisors (94262).

139018 is a wasteful number, since it uses less digits than its factorization.

139018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 139018 is about 372.8511767448. The cubic root of 139018 is about 51.8032505923.

Adding to 139018 its reverse (810931), we get a palindrome (949949).

The spelling of 139018 in words is "one hundred thirty-nine thousand, eighteen".