1389747 has 4 divisors (see below), whose sum is σ = 1853000. Its totient is φ = 926496.

The previous prime is 1389727. The next prime is 1389749. The reversal of 1389747 is 7479831.

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

It is not a de Polignac number, because 1389747 - 2⁸ = 1389491 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1389749) 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, 231622 + ... + 231627.

It is an arithmetic number, because the mean of its divisors is an integer number (463250).

2^1389747 is an apocalyptic number.

1389747 is a deficient number, since it is larger than the sum of its proper divisors (463253).

1389747 is an equidigital number, since it uses as much as digits as its factorization.

1389747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463252.

The product of its digits is 42336, while the sum is 39.

The square root of 1389747 is about 1178.8753114728. The cubic root of 1389747 is about 111.5951315305.

The spelling of 1389747 in words is "one million, three hundred eighty-nine thousand, seven hundred forty-seven".