1388881 has 8 divisors (see below), whose sum is σ = 1574720. Its totient is φ = 1214352.

The previous prime is 1388873. The next prime is 1388887. The reversal of 1388881 is 1888831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1388881 - 2³ = 1388873 is a prime.

It is a super-2 number, since 2×1388881² = 3857980864322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1388881.

It is not an unprimeable number, because it can be changed into a prime (1388887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2565 + ... + 3058.

It is an arithmetic number, because the mean of its divisors is an integer number (196840).

2^1388881 is an apocalyptic number.

It is an amenable number.

1388881 is a deficient number, since it is larger than the sum of its proper divisors (185839).

1388881 is a wasteful number, since it uses less digits than its factorization.

1388881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5655.

The product of its digits is 12288, while the sum is 37.

The square root of 1388881 is about 1178.5079550007. The cubic root of 1388881 is about 111.5719471033.

The spelling of 1388881 in words is "one million, three hundred eighty-eight thousand, eight hundred eighty-one".