1378864 has 10 divisors (see below), whose sum is σ = 2671580. Its totient is φ = 689424.

The previous prime is 1378859. The next prime is 1378903. The reversal of 1378864 is 4688731.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43074 + ... + 43105.

It is an arithmetic number, because the mean of its divisors is an integer number (267158).

2^1378864 is an apocalyptic number.

It is an amenable number.

1378864 is a deficient number, since it is larger than the sum of its proper divisors (1292716).

1378864 is an equidigital number, since it uses as much as digits as its factorization.

1378864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86187 (or 86181 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 1378864 is about 1174.2503991909. The cubic root of 1378864 is about 111.3030702483.

The spelling of 1378864 in words is "one million, three hundred seventy-eight thousand, eight hundred sixty-four".