139222865 has 8 divisors (see below), whose sum is σ = 167327208. Its totient is φ = 111205120.

The previous prime is 139222813. The next prime is 139222871. The reversal of 139222865 is 568222931.

It can be written as a sum of positive squares in 4 ways, for example, as 8737936 + 130484929 = 2956^2 + 11423^2 .

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

It is not a de Polignac number, because 139222865 - 2⁸ = 139222609 is a prime.

It is a super-2 number, since 2×139222865² = 38766012277616450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon 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, 18056 + ... + 24585.

It is an arithmetic number, because the mean of its divisors is an integer number (20915901).

It is the magic constant of a 653 × 653 magic square.

Almost surely, 2^139222865 is an apocalyptic number.

It is an amenable number.

139222865 is a deficient number, since it is larger than the sum of its proper divisors (28104343).

139222865 is an equidigital number, since it uses as much as digits as its factorization.

139222865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43299.

The product of its digits is 51840, while the sum is 38.

The square root of 139222865 is about 11799.2739183392. The cubic root of 139222865 is about 518.2868486233.

The spelling of 139222865 in words is "one hundred thirty-nine million, two hundred twenty-two thousand, eight hundred sixty-five".