1289644 has 24 divisors (see below), whose sum is σ = 2419200. Its totient is φ = 599760.

The previous prime is 1289627. The next prime is 1289653. The reversal of 1289644 is 4469821.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5277 + ... + 5515.

It is an arithmetic number, because the mean of its divisors is an integer number (100800).

2^1289644 is an apocalyptic number.

It is an amenable number.

1289644 is a deficient number, since it is larger than the sum of its proper divisors (1129556).

1289644 is a wasteful number, since it uses less digits than its factorization.

1289644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 331 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 1289644 is about 1135.6249380848. The cubic root of 1289644 is about 108.8487085466.

It can be divided in two parts, 1289 and 644, that multiplied together give a triangular number (830116 = T₁₂₈₈).

The spelling of 1289644 in words is "one million, two hundred eighty-nine thousand, six hundred forty-four".