1388155 has 8 divisors (see below), whose sum is σ = 1672992. Its totient is φ = 1105728.

The previous prime is 1388141. The next prime is 1388161. The reversal of 1388155 is 5518831.

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 1388155 - 2¹⁹ = 863867 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1122 + ... + 2008.

It is an arithmetic number, because the mean of its divisors is an integer number (209124).

2^1388155 is an apocalyptic number.

1388155 is a deficient number, since it is larger than the sum of its proper divisors (284837).

1388155 is an equidigital number, since it uses as much as digits as its factorization.

1388155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205.

The product of its digits is 4800, while the sum is 31.

The square root of 1388155 is about 1178.1998981497. The cubic root of 1388155 is about 111.5525033086.

The spelling of 1388155 in words is "one million, three hundred eighty-eight thousand, one hundred fifty-five".