11953987 has 4 divisors (see below), whose sum is σ = 12150016. Its totient is φ = 11757960.

The previous prime is 11953973. The next prime is 11953999. The reversal of 11953987 is 78935911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78935911 = 37 ⋅2133403.

It is a cyclic number.

It is not a de Polignac number, because 11953987 - 2¹⁵ = 11921219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11953937) 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, 97923 + ... + 98044.

It is an arithmetic number, because the mean of its divisors is an integer number (3037504).

Almost surely, 2^11953987 is an apocalyptic number.

11953987 is a deficient number, since it is larger than the sum of its proper divisors (196029).

11953987 is an equidigital number, since it uses as much as digits as its factorization.

11953987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196028.

The product of its digits is 68040, while the sum is 43.

The square root of 11953987 is about 3457.4538319405. The cubic root of 11953987 is about 228.6498529439.

The spelling of 11953987 in words is "eleven million, nine hundred fifty-three thousand, nine hundred eighty-seven".