1389405 has 8 divisors (see below), whose sum is σ = 2223072. Its totient is φ = 741008.

The previous prime is 1389403. The next prime is 1389431. The reversal of 1389405 is 5049831.

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 1389405 - 2¹ = 1389403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389403) 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, 46299 + ... + 46328.

It is an arithmetic number, because the mean of its divisors is an integer number (277884).

2^1389405 is an apocalyptic number.

1389405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1389405 is a deficient number, since it is larger than the sum of its proper divisors (833667).

1389405 is an equidigital number, since it uses as much as digits as its factorization.

1389405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92635.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1389405 is about 1178.7302490392. The cubic root of 1389405 is about 111.5859767069.

The spelling of 1389405 in words is "one million, three hundred eighty-nine thousand, four hundred five".