36139209 has 4 divisors (see below), whose sum is σ = 48185616. Its totient is φ = 24092804.

The previous prime is 36139189. The next prime is 36139217. The reversal of 36139209 is 90293163.

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 36139209 - 2⁸ = 36138953 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 36139209.

It is not an unprimeable number, because it can be changed into a prime (36139289) 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, 6023199 + ... + 6023204.

It is an arithmetic number, because the mean of its divisors is an integer number (12046404).

Almost surely, 2^36139209 is an apocalyptic number.

It is an amenable number.

36139209 is a deficient number, since it is larger than the sum of its proper divisors (12046407).

36139209 is a wasteful number, since it uses less digits than its factorization.

36139209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12046406.

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 36139209 is about 6011.5895568477. The cubic root of 36139209 is about 330.6177867168.

The spelling of 36139209 in words is "thirty-six million, one hundred thirty-nine thousand, two hundred nine".