11143985 has 4 divisors (see below), whose sum is σ = 13372788. Its totient is φ = 8915184.

The previous prime is 11143981. The next prime is 11143997. The reversal of 11143985 is 58934111.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1682209 + 9461776 = 1297^2 + 3076^2 .

It is a cyclic number.

It is not a de Polignac number, because 11143985 - 2² = 11143981 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11143981) 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, 1114394 + ... + 1114403.

It is an arithmetic number, because the mean of its divisors is an integer number (3343197).

Almost surely, 2^11143985 is an apocalyptic number.

It is an amenable number.

11143985 is a deficient number, since it is larger than the sum of its proper divisors (2228803).

11143985 is an equidigital number, since it uses as much as digits as its factorization.

11143985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2228802.

The product of its digits is 4320, while the sum is 32.

The square root of 11143985 is about 3338.2607747149. The cubic root of 11143985 is about 223.3641686589.

The spelling of 11143985 in words is "eleven million, one hundred forty-three thousand, nine hundred eighty-five".