1389979 has 4 divisors (see below), whose sum is σ = 1427584. Its totient is φ = 1352376.

The previous prime is 1389961. The next prime is 1389989. The reversal of 1389979 is 9799831.

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 1389979 - 2⁷ = 1389851 is a prime.

It is a Duffinian number.

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, 18747 + ... + 18820.

It is an arithmetic number, because the mean of its divisors is an integer number (356896).

2^1389979 is an apocalyptic number.

1389979 is a deficient number, since it is larger than the sum of its proper divisors (37605).

1389979 is an equidigital number, since it uses as much as digits as its factorization.

1389979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37604.

The product of its digits is 122472, while the sum is 46.

The square root of 1389979 is about 1178.9737062378. The cubic root of 1389979 is about 111.6013409653.

The spelling of 1389979 in words is "one million, three hundred eighty-nine thousand, nine hundred seventy-nine".