11955639 has 4 divisors (see below), whose sum is σ = 15940856. Its totient is φ = 7970424.

The previous prime is 11955599. The next prime is 11955649. The reversal of 11955639 is 93655911.

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

It is not a de Polignac number, because 11955639 - 2¹⁷ = 11824567 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11955597 and 11955606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11955649) 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, 1992604 + ... + 1992609.

It is an arithmetic number, because the mean of its divisors is an integer number (3985214).

Almost surely, 2^11955639 is an apocalyptic number.

11955639 is a deficient number, since it is larger than the sum of its proper divisors (3985217).

11955639 is an equidigital number, since it uses as much as digits as its factorization.

11955639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3985216.

The product of its digits is 36450, while the sum is 39.

The square root of 11955639 is about 3457.6927278172. The cubic root of 11955639 is about 228.6603853339.

The spelling of 11955639 in words is "eleven million, nine hundred fifty-five thousand, six hundred thirty-nine".