1389656 has 8 divisors (see below), whose sum is σ = 2605620. Its totient is φ = 694824.

The previous prime is 1389643. The next prime is 1389667. The reversal of 1389656 is 6569831.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1389656² = 3862287596672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86846 + ... + 86861.

2^1389656 is an apocalyptic number.

It is an amenable number.

1389656 is a deficient number, since it is larger than the sum of its proper divisors (1215964).

1389656 is a wasteful number, since it uses less digits than its factorization.

1389656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173713 (or 173709 counting only the distinct ones).

The product of its digits is 38880, while the sum is 38.

The square root of 1389656 is about 1178.8367147319. The cubic root of 1389656 is about 111.5926957446.

It can be divided in two parts, 138 and 9656, that multiplied together give a triangular number (1332528 = T₁₆₃₂).

The spelling of 1389656 in words is "one million, three hundred eighty-nine thousand, six hundred fifty-six".