1389918 has 16 divisors (see below), whose sum is σ = 2814336. Its totient is φ = 457560.

The previous prime is 1389917. The next prime is 1389919. The reversal of 1389918 is 8199831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1389917) and next prime (1389919).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 898 + ... + 1893.

It is an arithmetic number, because the mean of its divisors is an integer number (175896).

2^1389918 is an apocalyptic number.

1389918 is an abundant number, since it is smaller than the sum of its proper divisors (1424418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1389918 is a wasteful number, since it uses less digits than its factorization.

1389918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2879.

The product of its digits is 15552, while the sum is 39.

The square root of 1389918 is about 1178.9478359961. The cubic root of 1389918 is about 111.5997083791.

The spelling of 1389918 in words is "one million, three hundred eighty-nine thousand, nine hundred eighteen".