139225209 has 8 divisors (see below), whose sum is σ = 185817792. Its totient is φ = 92724720.

The previous prime is 139225199. The next prime is 139225211. The reversal of 139225209 is 902522931.

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

It is not a de Polignac number, because 139225209 - 2⁴ = 139225193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139225209.

It is not an unprimeable number, because it can be changed into a prime (139225109) 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, 19414 + ... + 25599.

It is an arithmetic number, because the mean of its divisors is an integer number (23227224).

Almost surely, 2^139225209 is an apocalyptic number.

It is an amenable number.

139225209 is a deficient number, since it is larger than the sum of its proper divisors (46592583).

139225209 is a wasteful number, since it uses less digits than its factorization.

139225209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46047.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 139225209 is about 11799.3732460669. The cubic root of 139225209 is about 518.2897572871.

The spelling of 139225209 in words is "one hundred thirty-nine million, two hundred twenty-five thousand, two hundred nine".