1389878 has 8 divisors (see below), whose sum is σ = 2382672. Its totient is φ = 595656.

The previous prime is 1389877. The next prime is 1389887. The reversal of 1389878 is 8789831.

It is a sphenic number, since it is the product of 3 distinct primes.

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 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, 49625 + ... + 49652.

It is an arithmetic number, because the mean of its divisors is an integer number (297834).

2^1389878 is an apocalyptic number.

1389878 is a deficient number, since it is larger than the sum of its proper divisors (992794).

1389878 is an equidigital number, since it uses as much as digits as its factorization.

1389878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99286.

The product of its digits is 96768, while the sum is 44.

The square root of 1389878 is about 1178.9308715951. The cubic root of 1389878 is about 111.5986378049.

The spelling of 1389878 in words is "one million, three hundred eighty-nine thousand, eight hundred seventy-eight".