1378656 has 36 divisors (see below), whose sum is σ = 3921372. Its totient is φ = 459456.

The previous prime is 1378639. The next prime is 1378669. The reversal of 1378656 is 6568731.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1378656.

It is a congruent 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 in 5 ways as a sum of consecutive naturals, for example, 2106 + ... + 2681.

It is an arithmetic number, because the mean of its divisors is an integer number (108927).

2^1378656 is an apocalyptic number.

1378656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1378656 is an abundant number, since it is smaller than the sum of its proper divisors (2542716).

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

1378656 is a wasteful number, since it uses less digits than its factorization.

1378656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4803 (or 4792 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 1378656 is about 1174.1618287102. The cubic root of 1378656 is about 111.2974733215.

The spelling of 1378656 in words is "one million, three hundred seventy-eight thousand, six hundred fifty-six".