1389287 has 4 divisors (see below), whose sum is σ = 1421640. Its totient is φ = 1356936.

The previous prime is 1389281. The next prime is 1389301. The reversal of 1389287 is 7829831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7829831 = 59 ⋅132709.

It is a cyclic number.

It is not a de Polignac number, because 1389287 - 2¹² = 1385191 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1389287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16112 + ... + 16197.

It is an arithmetic number, because the mean of its divisors is an integer number (355410).

2^1389287 is an apocalyptic number.

1389287 is a deficient number, since it is larger than the sum of its proper divisors (32353).

1389287 is an equidigital number, since it uses as much as digits as its factorization.

1389287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32352.

The product of its digits is 24192, while the sum is 38.

The square root of 1389287 is about 1178.6801941154. The cubic root of 1389287 is about 111.5828176765.

The spelling of 1389287 in words is "one million, three hundred eighty-nine thousand, two hundred eighty-seven".