1389478 has 8 divisors (see below), whose sum is σ = 2206872. Its totient is φ = 653856.

The previous prime is 1389473. The next prime is 1389481. The reversal of 1389478 is 8749831.

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

It is a super-2 number, since 2×1389478² = 3861298224968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1389478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20400 + ... + 20467.

It is an arithmetic number, because the mean of its divisors is an integer number (275859).

2^1389478 is an apocalyptic number.

1389478 is a deficient number, since it is larger than the sum of its proper divisors (817394).

1389478 is a wasteful number, since it uses less digits than its factorization.

1389478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40886.

The product of its digits is 48384, while the sum is 40.

The square root of 1389478 is about 1178.7612141566. The cubic root of 1389478 is about 111.5879309328.

The spelling of 1389478 in words is "one million, three hundred eighty-nine thousand, four hundred seventy-eight".