1389455 has 4 divisors (see below), whose sum is σ = 1667352. Its totient is φ = 1111560.

The previous prime is 1389439. The next prime is 1389469. The reversal of 1389455 is 5549831.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1389455 - 2⁴ = 1389439 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138941 + ... + 138950.

It is an arithmetic number, because the mean of its divisors is an integer number (416838).

2^1389455 is an apocalyptic number.

1389455 is a deficient number, since it is larger than the sum of its proper divisors (277897).

1389455 is an equidigital number, since it uses as much as digits as its factorization.

1389455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277896.

The product of its digits is 21600, while the sum is 35.

The square root of 1389455 is about 1178.7514581115. The cubic root of 1389455 is about 111.5873152251.

The spelling of 1389455 in words is "one million, three hundred eighty-nine thousand, four hundred fifty-five".