8405139 has 4 divisors (see below), whose sum is σ = 11206856. Its totient is φ = 5603424.

The previous prime is 8405101. The next prime is 8405149. The reversal of 8405139 is 9315048.

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

It is not a de Polignac number, because 8405139 - 2¹¹ = 8403091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8405149) 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, 1400854 + ... + 1400859.

It is an arithmetic number, because the mean of its divisors is an integer number (2801714).

Almost surely, 2^8405139 is an apocalyptic number.

8405139 is a deficient number, since it is larger than the sum of its proper divisors (2801717).

8405139 is a wasteful number, since it uses less digits than its factorization.

8405139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2801716.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 8405139 is about 2899.1617754103. The cubic root of 8405139 is about 203.3207173635.

Subtracting 8405139 from its reverse (9315048), we obtain a palindrome (909909).

The spelling of 8405139 in words is "eight million, four hundred five thousand, one hundred thirty-nine".