1389644 has 6 divisors (see below), whose sum is σ = 2431884. Its totient is φ = 694820.

The previous prime is 1389643. The next prime is 1389667. The reversal of 1389644 is 4469831.

It is a super-2 number, since 2×1389644² = 3862220893472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1389643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173702 + ... + 173709.

It is an arithmetic number, because the mean of its divisors is an integer number (405314).

2^1389644 is an apocalyptic number.

It is an amenable number.

1389644 is a deficient number, since it is larger than the sum of its proper divisors (1042240).

1389644 is a wasteful number, since it uses less digits than its factorization.

1389644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347415 (or 347413 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 1389644 is about 1178.8316249575. The cubic root of 1389644 is about 111.5923745341.

The spelling of 1389644 in words is "one million, three hundred eighty-nine thousand, six hundred forty-four".