1389815 has 8 divisors (see below), whose sum is σ = 1906080. Its totient is φ = 952992.

The previous prime is 1389811. The next prime is 1389833. The reversal of 1389815 is 5189831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1389815 - 2² = 1389811 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 39709 = 1389815 / (1 + 3 + 8 + 9 + 8 + 1 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19820 + ... + 19889.

It is an arithmetic number, because the mean of its divisors is an integer number (238260).

2^1389815 is an apocalyptic number.

1389815 is a deficient number, since it is larger than the sum of its proper divisors (516265).

1389815 is an equidigital number, since it uses as much as digits as its factorization.

1389815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39721.

The product of its digits is 8640, while the sum is 35.

The square root of 1389815 is about 1178.9041521684. The cubic root of 1389815 is about 111.5969516089.

The spelling of 1389815 in words is "one million, three hundred eighty-nine thousand, eight hundred fifteen".