11891964 has 48 divisors (see below), whose sum is σ = 32200448. Its totient is φ = 3345408.

The previous prime is 11891953. The next prime is 11892017. The reversal of 11891964 is 46919811.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4572 + ... + 6684.

Almost surely, 2^11891964 is an apocalyptic number.

11891964 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11891964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16100224).

11891964 is an abundant number, since it is smaller than the sum of its proper divisors (20308484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11891964 is a wasteful number, since it uses less digits than its factorization.

11891964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2194 (or 2192 counting only the distinct ones).

The product of its digits is 15552, while the sum is 39.

The square root of 11891964 is about 3448.4727054161. The cubic root of 11891964 is about 228.2537187877.

The spelling of 11891964 in words is "eleven million, eight hundred ninety-one thousand, nine hundred sixty-four".