139818 has 16 divisors (see below), whose sum is σ = 319680. Its totient is φ = 39936.

The previous prime is 139813. The next prime is 139831. The reversal of 139818 is 818931.

It is a Curzon number.

It is a plaindrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139818.

It is not an unprimeable number, because it can be changed into a prime (139813) by changing a digit.

139818 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1623 + ... + 1706.

It is an arithmetic number, because the mean of its divisors is an integer number (19980).

2¹³⁹⁸¹⁸ is an apocalyptic number.

139818 is an abundant number, since it is smaller than the sum of its proper divisors (179862).

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

139818 is a wasteful number, since it uses less digits than its factorization.

139818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3341.

The product of its digits is 1728, while the sum is 30.

The square root of 139818 is about 373.9224518533. The cubic root of 139818 is about 51.9024304533.

The spelling of 139818 in words is "one hundred thirty-nine thousand, eight hundred eighteen".