11987917 has 8 divisors (see below), whose sum is σ = 13026560. Its totient is φ = 10990080.

The previous prime is 11987909. The next prime is 11987923. The reversal of 11987917 is 71978911.

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

It is a cyclic number.

It is not a de Polignac number, because 11987917 - 2³ = 11987909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11987957) 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, 9588 + ... + 10765.

It is an arithmetic number, because the mean of its divisors is an integer number (1628320).

Almost surely, 2^11987917 is an apocalyptic number.

It is an amenable number.

11987917 is a deficient number, since it is larger than the sum of its proper divisors (1038643).

11987917 is a wasteful number, since it uses less digits than its factorization.

11987917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20403.

The product of its digits is 31752, while the sum is 43.

The square root of 11987917 is about 3462.3571450675. The cubic root of 11987917 is about 228.8659805817.

The spelling of 11987917 in words is "eleven million, nine hundred eighty-seven thousand, nine hundred seventeen".