11931639 has 8 divisors (see below), whose sum is σ = 16746240. Its totient is φ = 7535736.

The previous prime is 11931613. The next prime is 11931691. The reversal of 11931639 is 93613911.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11931639 - 2¹³ = 11923447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11911639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104607 + ... + 104720.

It is an arithmetic number, because the mean of its divisors is an integer number (2093280).

Almost surely, 2^11931639 is an apocalyptic number.

11931639 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

11931639 is a deficient number, since it is larger than the sum of its proper divisors (4814601).

11931639 is a wasteful number, since it uses less digits than its factorization.

11931639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209349.

The product of its digits is 4374, while the sum is 33.

The square root of 11931639 is about 3454.2204619856. The cubic root of 11931639 is about 228.5072769558.

The spelling of 11931639 in words is "eleven million, nine hundred thirty-one thousand, six hundred thirty-nine".