139222805 has 4 divisors (see below), whose sum is σ = 167067372. Its totient is φ = 111378240.

The previous prime is 139222793. The next prime is 139222813. The reversal of 139222805 is 508222931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508222931 = 5077 ⋅100103.

It can be written as a sum of positive squares in 2 ways, for example, as 16589329 + 122633476 = 4073^2 + 11074^2 .

It is not a de Polignac number, because 139222805 - 2⁸ = 139222549 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 3 ways as a sum of consecutive naturals, for example, 13922276 + ... + 13922285.

It is an arithmetic number, because the mean of its divisors is an integer number (41766843).

Almost surely, 2^139222805 is an apocalyptic number.

It is an amenable number.

139222805 is a deficient number, since it is larger than the sum of its proper divisors (27844567).

139222805 is an equidigital number, since it uses as much as digits as its factorization.

139222805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27844566.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 139222805 is about 11799.2713758096. The cubic root of 139222805 is about 518.2867741690.

The spelling of 139222805 in words is "one hundred thirty-nine million, two hundred twenty-two thousand, eight hundred five".