1389643 has 2 divisors, whose sum is σ = 1389644. Its totient is φ = 1389642.

The previous prime is 1389629. The next prime is 1389667. The reversal of 1389643 is 3469831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1389643 - 2¹³ = 1381451 is a prime.

It is a super-2 number, since 2×1389643² = 3862215334898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1389599 and 1389608.

It is not a weakly prime, because it can be changed into another prime (1389623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694821 + 694822.

It is an arithmetic number, because the mean of its divisors is an integer number (694822).

2^1389643 is an apocalyptic number.

1389643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389643 is an equidigital number, since it uses as much as digits as its factorization.

1389643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 34.

The square root of 1389643 is about 1178.8312008087. The cubic root of 1389643 is about 111.5923477665.

The spelling of 1389643 in words is "one million, three hundred eighty-nine thousand, six hundred forty-three".