138965573 has 4 divisors (see below), whose sum is σ = 139671180. Its totient is φ = 138259968.

The previous prime is 138965557. The next prime is 138965581. The reversal of 138965573 is 375569831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64609444 + 74356129 = 8038^2 + 8623^2 .

It is a cyclic number.

It is not a de Polignac number, because 138965573 - 2⁴ = 138965557 is a prime.

It is a super-2 number, since 2×138965573² = 38622860958436658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138965513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352508 + ... + 352901.

It is an arithmetic number, because the mean of its divisors is an integer number (34917795).

Almost surely, 2^138965573 is an apocalyptic number.

It is an amenable number.

138965573 is a deficient number, since it is larger than the sum of its proper divisors (705607).

138965573 is an equidigital number, since it uses as much as digits as its factorization.

138965573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705606.

The product of its digits is 680400, while the sum is 47.

The square root of 138965573 is about 11788.3660021226. The cubic root of 138965573 is about 517.9673769351.

The spelling of 138965573 in words is "one hundred thirty-eight million, nine hundred sixty-five thousand, five hundred seventy-three".