11939869 has 4 divisors (see below), whose sum is σ = 12118144. Its totient is φ = 11761596.

The previous prime is 11939849. The next prime is 11939881. The reversal of 11939869 is 96893911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11939869 - 2¹⁵ = 11907101 is a prime.

It is a super-2 number, since 2×11939869² = 285120943474322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11939849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89037 + ... + 89170.

It is an arithmetic number, because the mean of its divisors is an integer number (3029536).

Almost surely, 2^11939869 is an apocalyptic number.

It is an amenable number.

11939869 is a deficient number, since it is larger than the sum of its proper divisors (178275).

11939869 is an equidigital number, since it uses as much as digits as its factorization.

11939869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178274.

The product of its digits is 104976, while the sum is 46.

The square root of 11939869 is about 3455.4115529123. The cubic root of 11939869 is about 228.5598034824.

The spelling of 11939869 in words is "eleven million, nine hundred thirty-nine thousand, eight hundred sixty-nine".