138965539 has 8 divisors (see below), whose sum is σ = 140276448. Its totient is φ = 137659200.

The previous prime is 138965513. The next prime is 138965557. The reversal of 138965539 is 935569831.

It is a happy number.

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 138965539 - 2¹⁵ = 138932771 is a prime.

It is a super-2 number, since 2×138965539² = 38622842059121042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138965492 and 138965501.

It is not an unprimeable number, because it can be changed into a prime (138966539) 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, 95314 + ... + 96760.

It is an arithmetic number, because the mean of its divisors is an integer number (17534556).

Almost surely, 2^138965539 is an apocalyptic number.

138965539 is a deficient number, since it is larger than the sum of its proper divisors (1310909).

138965539 is a wasteful number, since it uses less digits than its factorization.

138965539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285.

The product of its digits is 874800, while the sum is 49.

The square root of 138965539 is about 11788.3645600227. The cubic root of 138965539 is about 517.9673346922.

The spelling of 138965539 in words is "one hundred thirty-eight million, nine hundred sixty-five thousand, five hundred thirty-nine".