11890987 has 4 divisors (see below), whose sum is σ = 11928816. Its totient is φ = 11853160.

The previous prime is 11890969. The next prime is 11890993. The reversal of 11890987 is 78909811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78909811 = 439 ⋅179749.

It is a cyclic number.

It is not a de Polignac number, because 11890987 - 2¹¹ = 11888939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11890927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18439 + ... + 19072.

It is an arithmetic number, because the mean of its divisors is an integer number (2982204).

Almost surely, 2^11890987 is an apocalyptic number.

11890987 is a deficient number, since it is larger than the sum of its proper divisors (37829).

11890987 is an equidigital number, since it uses as much as digits as its factorization.

11890987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37828.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 11890987 is about 3448.3310455929. The cubic root of 11890987 is about 228.2474677880.

The spelling of 11890987 in words is "eleven million, eight hundred ninety thousand, nine hundred eighty-seven".