1389739 has 4 divisors (see below), whose sum is σ = 1496656. Its totient is φ = 1282824.

The previous prime is 1389727. The next prime is 1389749. The reversal of 1389739 is 9379831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9379831 = 373 ⋅25147.

It is a cyclic number.

It is not a de Polignac number, because 1389739 - 2¹¹ = 1387691 is a prime.

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, 53439 + ... + 53464.

It is an arithmetic number, because the mean of its divisors is an integer number (374164).

2^1389739 is an apocalyptic number.

1389739 is a deficient number, since it is larger than the sum of its proper divisors (106917).

1389739 is a wasteful number, since it uses less digits than its factorization.

1389739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106916.

The product of its digits is 40824, while the sum is 40.

The square root of 1389739 is about 1178.8719184034. The cubic root of 1389739 is about 111.5949173998.

The spelling of 1389739 in words is "one million, three hundred eighty-nine thousand, seven hundred thirty-nine".