1389428 has 12 divisors (see below), whose sum is σ = 2457252. Its totient is φ = 687360.

The previous prime is 1389403. The next prime is 1389431. The reversal of 1389428 is 8249831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 964324 + 425104 = 982^2 + 652^2 .

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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, 1403 + ... + 2178.

It is an arithmetic number, because the mean of its divisors is an integer number (204771).

2^1389428 is an apocalyptic number.

It is an amenable number.

1389428 is a deficient number, since it is larger than the sum of its proper divisors (1067824).

1389428 is a wasteful number, since it uses less digits than its factorization.

1389428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3682 (or 3680 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 1389428 is about 1178.7400052599. The cubic root of 1389428 is about 111.5865924293.

The spelling of 1389428 in words is "one million, three hundred eighty-nine thousand, four hundred twenty-eight".