1389939 has 4 divisors (see below), whose sum is σ = 1853256. Its totient is φ = 926624.

The previous prime is 1389919. The next prime is 1389943. The reversal of 1389939 is 9399831.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1389939 - 2⁷ = 1389811 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1389939.

It is not an unprimeable number, because it can be changed into a prime (1389919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231654 + ... + 231659.

It is an arithmetic number, because the mean of its divisors is an integer number (463314).

2^1389939 is an apocalyptic number.

1389939 is a deficient number, since it is larger than the sum of its proper divisors (463317).

1389939 is an equidigital number, since it uses as much as digits as its factorization.

1389939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463316.

The product of its digits is 52488, while the sum is 42.

The square root of 1389939 is about 1178.9567422090. The cubic root of 1389939 is about 111.6002704224.

The spelling of 1389939 in words is "one million, three hundred eighty-nine thousand, nine hundred thirty-nine".