1389426 has 8 divisors (see below), whose sum is σ = 2778864. Its totient is φ = 463140.

The previous prime is 1389403. The next prime is 1389431. The reversal of 1389426 is 6249831.

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

1389426 is an admirable 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, 115780 + ... + 115791.

It is an arithmetic number, because the mean of its divisors is an integer number (347358).

2^1389426 is an apocalyptic number.

1389426 is the 746-th centered pentagonal number.

1389426 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1389426 is a wasteful number, since it uses less digits than its factorization.

1389426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231576.

The product of its digits is 10368, while the sum is 33.

The square root of 1389426 is about 1178.7391568960. The cubic root of 1389426 is about 111.5865388885.

The spelling of 1389426 in words is "one million, three hundred eighty-nine thousand, four hundred twenty-six".