1389864 has 32 divisors (see below), whose sum is σ = 3971520. Its totient is φ = 397056.

The previous prime is 1389853. The next prime is 1389877. The reversal of 1389864 is 4689831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3969 + ... + 4304.

It is an arithmetic number, because the mean of its divisors is an integer number (124110).

2^1389864 is an apocalyptic number.

1389864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1389864 is an abundant number, since it is smaller than the sum of its proper divisors (2581656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1389864 is a wasteful number, since it uses less digits than its factorization.

1389864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8289 (or 8285 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 1389864 is about 1178.9249339971. The cubic root of 1389864 is about 111.5982630991.

The spelling of 1389864 in words is "one million, three hundred eighty-nine thousand, eight hundred sixty-four".