1389863 has 4 divisors (see below), whose sum is σ = 1413480. Its totient is φ = 1366248.

The previous prime is 1389853. The next prime is 1389877. The reversal of 1389863 is 3689831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3689831 = 163 ⋅22637.

It is a cyclic number.

It is not a de Polignac number, because 1389863 - 2¹² = 1385767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11720 + ... + 11837.

It is an arithmetic number, because the mean of its divisors is an integer number (353370).

2^1389863 is an apocalyptic number.

1389863 is a deficient number, since it is larger than the sum of its proper divisors (23617).

1389863 is an equidigital number, since it uses as much as digits as its factorization.

1389863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23616.

The product of its digits is 31104, while the sum is 38.

The square root of 1389863 is about 1178.9245098818. The cubic root of 1389863 is about 111.5982363343.

Subtracting 1389863 from its reverse (3689831), we obtain a cube (2299968 = 132³).

It can be divided in two parts, 138 and 9863, that added together give a palindrome (10001).

The spelling of 1389863 in words is "one million, three hundred eighty-nine thousand, eight hundred sixty-three".