1143985 has 4 divisors (see below), whose sum is σ = 1372788. Its totient is φ = 915184.

The previous prime is 1143977. The next prime is 1144001. The reversal of 1143985 is 5893411.

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 712336 + 431649 = 844^2 + 657^2 .

It is a cyclic number.

It is not a de Polignac number, because 1143985 - 2³ = 1143977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114394 + ... + 114403.

It is an arithmetic number, because the mean of its divisors is an integer number (343197).

2^1143985 is an apocalyptic number.

It is an amenable number.

1143985 is a deficient number, since it is larger than the sum of its proper divisors (228803).

1143985 is an equidigital number, since it uses as much as digits as its factorization.

1143985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228802.

The product of its digits is 4320, while the sum is 31.

The square root of 1143985 is about 1069.5723444443. The cubic root of 1143985 is about 104.5859735246.

It can be divided in two parts, 11439 and 85, that multiplied together give a triangular number (972315 = T₁₃₉₄).

The spelling of 1143985 in words is "one million, one hundred forty-three thousand, nine hundred eighty-five".