1143644 has 12 divisors (see below), whose sum is σ = 2070600. Its totient is φ = 552048.

The previous prime is 1143643. The next prime is 1143647. The reversal of 1143644 is 4463411.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143643) 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 3 ways as a sum of consecutive naturals, for example, 4814 + ... + 5045.

It is an arithmetic number, because the mean of its divisors is an integer number (172550).

2^1143644 is an apocalyptic number.

It is an amenable number.

1143644 is a deficient number, since it is larger than the sum of its proper divisors (926956).

1143644 is a wasteful number, since it uses less digits than its factorization.

1143644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9892 (or 9890 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

The square root of 1143644 is about 1069.4129230564. The cubic root of 1143644 is about 104.5755808006.

It can be divided in two parts, 114 and 3644, that multiplied together give a triangular number (415416 = T₉₁₁).

The spelling of 1143644 in words is "one million, one hundred forty-three thousand, six hundred forty-four".