11998887 has 4 divisors (see below), whose sum is σ = 15998520. Its totient is φ = 7999256.

The previous prime is 11998859. The next prime is 11998927. The reversal of 11998887 is 78889911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11998887 - 2⁷ = 11998759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11998807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1999812 + ... + 1999817.

It is an arithmetic number, because the mean of its divisors is an integer number (3999630).

Almost surely, 2^11998887 is an apocalyptic number.

11998887 is a deficient number, since it is larger than the sum of its proper divisors (3999633).

11998887 is an equidigital number, since it uses as much as digits as its factorization.

11998887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3999632.

The product of its digits is 290304, while the sum is 51.

The square root of 11998887 is about 3463.9409637002. The cubic root of 11998887 is about 228.9357701421.

The spelling of 11998887 in words is "eleven million, nine hundred ninety-eight thousand, eight hundred eighty-seven".