1381868 has 12 divisors (see below), whose sum is σ = 2449440. Its totient is φ = 682032.

The previous prime is 1381859. The next prime is 1381871. The reversal of 1381868 is 8681831.

It is a happy number.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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, 1871 + ... + 2502.

It is an arithmetic number, because the mean of its divisors is an integer number (204120).

2^1381868 is an apocalyptic number.

It is an amenable number.

1381868 is a deficient number, since it is larger than the sum of its proper divisors (1067572).

1381868 is a wasteful number, since it uses less digits than its factorization.

1381868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4456 (or 4454 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 1381868 is about 1175.5288171712. The cubic root of 1381868 is about 111.3838400965.

The spelling of 1381868 in words is "one million, three hundred eighty-one thousand, eight hundred sixty-eight".