11887791 has 8 divisors (see below), whose sum is σ = 15872640. Its totient is φ = 7914072.

The previous prime is 11887789. The next prime is 11887793. The reversal of 11887791 is 19778811.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11887789) and next prime (11887793).

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

It is not a de Polignac number, because 11887791 - 2¹ = 11887789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11887793) 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, 156 + ... + 4878.

It is an arithmetic number, because the mean of its divisors is an integer number (1984080).

Almost surely, 2^11887791 is an apocalyptic number.

11887791 is a deficient number, since it is larger than the sum of its proper divisors (3984849).

11887791 is an equidigital number, since it uses as much as digits as its factorization.

11887791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5565.

The product of its digits is 28224, while the sum is 42.

The square root of 11887791 is about 3447.8676018664. The cubic root of 11887791 is about 228.2270168848.

The spelling of 11887791 in words is "eleven million, eight hundred eighty-seven thousand, seven hundred ninety-one".