1143405 has 12 divisors (see below), whose sum is σ = 1981980. Its totient is φ = 609792.

The previous prime is 1143391. The next prime is 1143407. The reversal of 1143405 is 5043411.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 233289 + 910116 = 483^2 + 954^2 .

It is not a de Polignac number, because 1143405 - 2⁶ = 1143341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12660 + ... + 12749.

It is an arithmetic number, because the mean of its divisors is an integer number (165165).

2^1143405 is an apocalyptic number.

1143405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1143405 is a deficient number, since it is larger than the sum of its proper divisors (838575).

1143405 is a wasteful number, since it uses less digits than its factorization.

1143405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25420 (or 25417 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1143405 is about 1069.3011736644. The cubic root of 1143405 is about 104.5682955192.

Adding to 1143405 its reverse (5043411), we get a palindrome (6186816).

The spelling of 1143405 in words is "one million, one hundred forty-three thousand, four hundred five".