139618 has 4 divisors (see below), whose sum is σ = 209430. Its totient is φ = 69808.

The previous prime is 139609. The next prime is 139619. The reversal of 139618 is 816931.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 94249 + 45369 = 307^2 + 213^2 .

It is not an unprimeable number, because it can be changed into a prime (139619) by changing a digit.

139618 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 as a sum of consecutive naturals, namely, 34903 + ... + 34906.

2¹³⁹⁶¹⁸ is an apocalyptic number.

139618 is a deficient number, since it is larger than the sum of its proper divisors (69812).

139618 is an equidigital number, since it uses as much as digits as its factorization.

139618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69811.

The product of its digits is 1296, while the sum is 28.

The square root of 139618 is about 373.6549210167. The cubic root of 139618 is about 51.8776710291.

It can be divided in two parts, 139 and 618, that added together give a palindrome (757).

The spelling of 139618 in words is "one hundred thirty-nine thousand, six hundred eighteen".