11656139 has 16 divisors (see below), whose sum is σ = 13706880. Its totient is φ = 9797760.

The previous prime is 11656111. The next prime is 11656159. The reversal of 11656139 is 93165611.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11656139 - 2¹⁶ = 11590603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11656109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8339 + ... + 9635.

It is an arithmetic number, because the mean of its divisors is an integer number (856680).

Almost surely, 2^11656139 is an apocalyptic number.

11656139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

11656139 is a deficient number, since it is larger than the sum of its proper divisors (2050741).

11656139 is a wasteful number, since it uses less digits than its factorization.

11656139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1370.

The product of its digits is 4860, while the sum is 32.

The square root of 11656139 is about 3414.1088149032. The cubic root of 11656139 is about 226.7348297979.

The spelling of 11656139 in words is "eleven million, six hundred fifty-six thousand, one hundred thirty-nine".