11977691 has 8 divisors (see below), whose sum is σ = 13197168. Its totient is φ = 10780000.

The previous prime is 11977681. The next prime is 11977717. The reversal of 11977691 is 19677911.

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

It is not a de Polignac number, because 11977691 - 2⁶ = 11977627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11977601) 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, 4280 + ... + 6501.

It is an arithmetic number, because the mean of its divisors is an integer number (1649646).

Almost surely, 2^11977691 is an apocalyptic number.

11977691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11977691 is a deficient number, since it is larger than the sum of its proper divisors (1219477).

11977691 is a wasteful number, since it uses less digits than its factorization.

11977691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10893.

The product of its digits is 23814, while the sum is 41.

The square root of 11977691 is about 3460.8800903816. The cubic root of 11977691 is about 228.8008858895.

It can be divided in two parts, 1197 and 7691, that added together give a palindrome (8888).

The spelling of 11977691 in words is "eleven million, nine hundred seventy-seven thousand, six hundred ninety-one".