139207645 has 8 divisors (see below), whose sum is σ = 176875704. Its totient is φ = 104815104.

The previous prime is 139207631. The next prime is 139207657. The reversal of 139207645 is 546702931.

It can be written as a sum of positive squares in 4 ways, for example, as 23020804 + 116186841 = 4798^2 + 10779^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 139207645 - 2¹⁵ = 139174877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 818784 + ... + 818953.

It is an arithmetic number, because the mean of its divisors is an integer number (22109463).

Almost surely, 2^139207645 is an apocalyptic number.

It is an amenable number.

139207645 is a deficient number, since it is larger than the sum of its proper divisors (37668059).

139207645 is a wasteful number, since it uses less digits than its factorization.

139207645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637759.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 139207645 is about 11798.6289457716. The cubic root of 139207645 is about 518.2679613681.

The spelling of 139207645 in words is "one hundred thirty-nine million, two hundred seven thousand, six hundred forty-five".