1389915 has 24 divisors (see below), whose sum is σ = 2450448. Its totient is φ = 728640.

The previous prime is 1389911. The next prime is 1389917. The reversal of 1389915 is 5199831.

It is a happy number.

It is not a de Polignac number, because 1389915 - 2² = 1389911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1389915.

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 23 ways as a sum of consecutive naturals, for example, 2785 + ... + 3245.

It is an arithmetic number, because the mean of its divisors is an integer number (102102).

2^1389915 is an apocalyptic number.

1389915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1389915 is a deficient number, since it is larger than the sum of its proper divisors (1060533).

1389915 is a wasteful number, since it uses less digits than its factorization.

1389915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539 (or 536 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 1389915 is about 1178.9465636745. The cubic root of 1389915 is about 111.5996280868.

It can be divided in two parts, 1389 and 915, that added together give a square (2304 = 48²).

The spelling of 1389915 in words is "one million, three hundred eighty-nine thousand, nine hundred fifteen".