1389663 has 16 divisors (see below), whose sum is σ = 2246400. Its totient is φ = 842040.

The previous prime is 1389643. The next prime is 1389667. The reversal of 1389663 is 3669831.

It is a happy number.

1389663 is an esthetic number in base 5, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 1389663 - 2²⁰ = 341087 is a prime.

It is a super-3 number, since 3×1389663³ = 8050998361333371741, which contains 333 as substring.

1389663 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2043 + ... + 2636.

It is an arithmetic number, because the mean of its divisors is an integer number (140400).

2^1389663 is an apocalyptic number.

1389663 is a deficient number, since it is larger than the sum of its proper divisors (856737).

1389663 is a wasteful number, since it uses less digits than its factorization.

1389663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4699 (or 4693 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 1389663 is about 1178.8396837569. The cubic root of 1389663 is about 111.5928831165.

It can be divided in two parts, 138 and 9663, that added together give a square (9801 = 99²).

The spelling of 1389663 in words is "one million, three hundred eighty-nine thousand, six hundred sixty-three".