8409139 has 4 divisors (see below), whose sum is σ = 8567856. Its totient is φ = 8250424.

The previous prime is 8409133. The next prime is 8409173. The reversal of 8409139 is 9319048.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8409139 - 2¹⁵ = 8376371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8409133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79279 + ... + 79384.

It is an arithmetic number, because the mean of its divisors is an integer number (2141964).

Almost surely, 2^8409139 is an apocalyptic number.

8409139 is a deficient number, since it is larger than the sum of its proper divisors (158717).

8409139 is a wasteful number, since it uses less digits than its factorization.

8409139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158716.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 8409139 is about 2899.8515479245. The cubic root of 8409139 is about 203.3529656460.

Subtracting 8409139 from its reverse (9319048), we obtain a palindrome (909909).

The spelling of 8409139 in words is "eight million, four hundred nine thousand, one hundred thirty-nine".