1389879 has 10 divisors (see below), whose sum is σ = 2076360. Its totient is φ = 926532.

The previous prime is 1389877. The next prime is 1389887. The reversal of 1389879 is 9789831.

It is not a de Polignac number, because 1389879 - 2¹ = 1389877 is a prime.

1389879 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389877) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 8499 + ... + 8660.

It is an arithmetic number, because the mean of its divisors is an integer number (207636).

2^1389879 is an apocalyptic number.

1389879 is a deficient number, since it is larger than the sum of its proper divisors (686481).

1389879 is an equidigital number, since it uses as much as digits as its factorization.

1389879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17171 (or 17162 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 1389879 is about 1178.9312957081. The cubic root of 1389879 is about 111.5986645695.

The spelling of 1389879 in words is "one million, three hundred eighty-nine thousand, eight hundred seventy-nine".