139105205838369 has 27 divisors (see below), whose sum is σ = 201316096325617. Its totient is φ = 92558828101416.

The previous prime is 139105205838293. The next prime is 139105205838373. The reversal of 139105205838369 is 963838502501931.

It is a happy number.

The square root of 139105205838369 is 11794287.

It is a perfect power (a square), and thus also a powerful number.

139105205838369 is a `hidden beast` number, since 1 + 3 + 9 + 10 + 5 + 2 + 0 + 583 + 8 + 36 + 9 = 666.

It is not a de Polignac number, because 139105205838369 - 2⁷ = 139105205838241 is a prime.

It is a super-2 number, since 2×139105205838369² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139105205838169) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 19920547252 + ... + 19920554234.

Almost surely, 2^{139105205838369} is an apocalyptic number.

139105205838369 is the 11794287-th square number.

139105205838369 is the 5897144-th centered octagonal number.

It is an amenable number.

139105205838369 is a deficient number, since it is larger than the sum of its proper divisors (62210890487248).

139105205838369 is an frugal number, since it uses more digits than its factorization.

139105205838369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15098 (or 7549 counting only the distinct ones).

The product of its (nonzero) digits is 41990400, while the sum is 63.

The spelling of 139105205838369 in words is "one hundred thirty-nine trillion, one hundred five billion, two hundred five million, eight hundred thirty-eight thousand, three hundred sixty-nine".