139321618 has 8 divisors (see below), whose sum is σ = 209850300. Its totient is φ = 69371520.

The previous prime is 139321601. The next prime is 139321619. The reversal of 139321618 is 816123931.

139321618 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 138462289 + 859329 = 11767^2 + 927^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×139321618³ (a number of 25 digits) contains 333 as substring.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (139321619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144043 + ... + 145006.

Almost surely, 2^139321618 is an apocalyptic number.

139321618 is a deficient number, since it is larger than the sum of its proper divisors (70528682).

139321618 is a wasteful number, since it uses less digits than its factorization.

139321618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289292.

The product of its digits is 7776, while the sum is 34.

The square root of 139321618 is about 11803.4578831798. The cubic root of 139321618 is about 518.4093627051.

The spelling of 139321618 in words is "one hundred thirty-nine million, three hundred twenty-one thousand, six hundred eighteen".