1389278 has 8 divisors (see below), whose sum is σ = 2273400. Its totient is φ = 631480.

The previous prime is 1389277. The next prime is 1389281. The reversal of 1389278 is 8729831.

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

It is a super-3 number, since 3×1389278³ = 8044308734333738856, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31553 + ... + 31596.

It is an arithmetic number, because the mean of its divisors is an integer number (284175).

2^1389278 is an apocalyptic number.

1389278 is a deficient number, since it is larger than the sum of its proper divisors (884122).

1389278 is a wasteful number, since it uses less digits than its factorization.

1389278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63162.

The product of its digits is 24192, while the sum is 38.

The square root of 1389278 is about 1178.6763762798. The cubic root of 1389278 is about 111.5825767261.

The spelling of 1389278 in words is "one million, three hundred eighty-nine thousand, two hundred seventy-eight".