1378881 has 24 divisors (see below), whose sum is σ = 2333760. Its totient is φ = 768096.

The previous prime is 1378859. The next prime is 1378903. The reversal of 1378881 is 1888731.

It is an interprime number because it is at equal distance from previous prime (1378859) and next prime (1378903).

It is not a de Polignac number, because 1378881 - 2¹⁹ = 854593 is a prime.

It is a super-2 number, since 2×1378881² = 3802625624322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1378801) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2455 + ... + 2963.

It is an arithmetic number, because the mean of its divisors is an integer number (97240).

2^1378881 is an apocalyptic number.

It is an amenable number.

1378881 is a deficient number, since it is larger than the sum of its proper divisors (954879).

1378881 is a wasteful number, since it uses less digits than its factorization.

1378881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565 (or 562 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 1378881 is about 1174.2576378291. The cubic root of 1378881 is about 111.3035276646.

The spelling of 1378881 in words is "one million, three hundred seventy-eight thousand, eight hundred eighty-one".