139389665 has 8 divisors (see below), whose sum is σ = 167563968. Its totient is φ = 111314160.

The previous prime is 139389661. The next prime is 139389673. The reversal of 139389665 is 566983931.

139389665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 139389665 - 2² = 139389661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139389661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21557 + ... + 27266.

It is an arithmetic number, because the mean of its divisors is an integer number (20945496).

Almost surely, 2^139389665 is an apocalyptic number.

It is an amenable number.

139389665 is a deficient number, since it is larger than the sum of its proper divisors (28174303).

139389665 is an equidigital number, since it uses as much as digits as its factorization.

139389665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49399.

The product of its digits is 1049760, while the sum is 50.

The square root of 139389665 is about 11806.3400340664. The cubic root of 139389665 is about 518.4937488920.

The spelling of 139389665 in words is "one hundred thirty-nine million, three hundred eighty-nine thousand, six hundred sixty-five".