11996781 has 8 divisors (see below), whose sum is σ = 16936704. Its totient is φ = 7527360.

The previous prime is 11996773. The next prime is 11996791. The reversal of 11996781 is 18769911.

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

It is not a de Polignac number, because 11996781 - 2³ = 11996773 is a prime.

It is a super-2 number, since 2×11996781² = 287845508723922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11996701) 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, 117565 + ... + 117666.

It is an arithmetic number, because the mean of its divisors is an integer number (2117088).

Almost surely, 2^11996781 is an apocalyptic number.

It is an amenable number.

11996781 is a deficient number, since it is larger than the sum of its proper divisors (4939923).

11996781 is a wasteful number, since it uses less digits than its factorization.

11996781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235251.

The product of its digits is 27216, while the sum is 42.

The square root of 11996781 is about 3463.6369613457. The cubic root of 11996781 is about 228.9223753735.

The spelling of 11996781 in words is "eleven million, nine hundred ninety-six thousand, seven hundred eighty-one".