1389873 has 4 divisors (see below), whose sum is σ = 1853168. Its totient is φ = 926580.

The previous prime is 1389853. The next prime is 1389877. The reversal of 1389873 is 3789831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1389873 - 2⁵ = 1389841 is a prime.

It is a super-2 number, since 2×1389873² = 3863493912258, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 231643 + ... + 231648.

It is an arithmetic number, because the mean of its divisors is an integer number (463292).

2^1389873 is an apocalyptic number.

It is an amenable number.

1389873 is a deficient number, since it is larger than the sum of its proper divisors (463295).

1389873 is an equidigital number, since it uses as much as digits as its factorization.

1389873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463294.

The product of its digits is 36288, while the sum is 39.

The square root of 1389873 is about 1178.9287510278. The cubic root of 1389873 is about 111.5985039817.

It can be divided in two parts, 138 and 9873, that added together give a triangular number (10011 = T₁₄₁).

The spelling of 1389873 in words is "one million, three hundred eighty-nine thousand, eight hundred seventy-three".