10139209 has 4 divisors (see below), whose sum is σ = 10311120. Its totient is φ = 9967300.

The previous prime is 10139203. The next prime is 10139231. The reversal of 10139209 is 90293101.

10139209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10139209 - 2⁷ = 10139081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10139203) 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, 85867 + ... + 85984.

It is an arithmetic number, because the mean of its divisors is an integer number (2577780).

Almost surely, 2^10139209 is an apocalyptic number.

It is an amenable number.

10139209 is a deficient number, since it is larger than the sum of its proper divisors (171911).

10139209 is an equidigital number, since it uses as much as digits as its factorization.

10139209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171910.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 10139209 is about 3184.2124615044. The cubic root of 10139209 is about 216.4385878686.

The spelling of 10139209 in words is "ten million, one hundred thirty-nine thousand, two hundred nine".