1143903 has 4 divisors (see below), whose sum is σ = 1525208. Its totient is φ = 762600.

The previous prime is 1143893. The next prime is 1143943. The reversal of 1143903 is 3093411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3093411 = 3 ⋅1031137.

It is not a de Polignac number, because 1143903 - 2⁴ = 1143887 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1143903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143943) 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, 190648 + ... + 190653.

It is an arithmetic number, because the mean of its divisors is an integer number (381302).

2^1143903 is an apocalyptic number.

1143903 is a deficient number, since it is larger than the sum of its proper divisors (381305).

1143903 is an equidigital number, since it uses as much as digits as its factorization.

1143903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381304.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 1143903 is about 1069.5340106794. The cubic root of 1143903 is about 104.5834745831.

The spelling of 1143903 in words is "one million, one hundred forty-three thousand, nine hundred three".