1389687 has 12 divisors (see below), whose sum is σ = 2007144. Its totient is φ = 854880.

The previous prime is 1389677. The next prime is 1389697. The reversal of 1389687 is 7869831.

It is an interprime number because it is at equal distance from previous prime (1389677) and next prime (1389697).

It is not a de Polignac number, because 1389687 - 2⁶ = 1389623 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 864 + ... + 1877.

It is an arithmetic number, because the mean of its divisors is an integer number (167262).

2^1389687 is an apocalyptic number.

1389687 is a deficient number, since it is larger than the sum of its proper divisors (617457).

1389687 is a wasteful number, since it uses less digits than its factorization.

1389687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2770 (or 2757 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 1389687 is about 1178.8498632141. The cubic root of 1389687 is about 111.5935255298.

The spelling of 1389687 in words is "one million, three hundred eighty-nine thousand, six hundred eighty-seven".