1388215 has 4 divisors (see below), whose sum is σ = 1665864. Its totient is φ = 1110568.

The previous prime is 1388183. The next prime is 1388227. The reversal of 1388215 is 5128831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5128831 = 107 ⋅47933.

It is a cyclic number.

It is not a de Polignac number, because 1388215 - 2⁵ = 1388183 is a prime.

It is a Duffinian number.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 138817 + ... + 138826.

It is an arithmetic number, because the mean of its divisors is an integer number (416466).

2^1388215 is an apocalyptic number.

1388215 is a deficient number, since it is larger than the sum of its proper divisors (277649).

1388215 is an equidigital number, since it uses as much as digits as its factorization.

1388215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277648.

The product of its digits is 1920, while the sum is 28.

The square root of 1388215 is about 1178.2253604468. The cubic root of 1388215 is about 111.5541104907.

The spelling of 1388215 in words is "one million, three hundred eighty-eight thousand, two hundred fifteen".