1388285 has 4 divisors (see below), whose sum is σ = 1665948. Its totient is φ = 1110624.

The previous prime is 1388279. The next prime is 1388287. The reversal of 1388285 is 5828831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5828831 = 73 ⋅79847.

It can be written as a sum of positive squares in 2 ways, for example, as 158404 + 1229881 = 398^2 + 1109^2 .

It is a cyclic number.

It is not a de Polignac number, because 1388285 - 2⁴ = 1388269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138824 + ... + 138833.

It is an arithmetic number, because the mean of its divisors is an integer number (416487).

2^1388285 is an apocalyptic number.

It is an amenable number.

1388285 is a deficient number, since it is larger than the sum of its proper divisors (277663).

1388285 is an equidigital number, since it uses as much as digits as its factorization.

1388285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277662.

The product of its digits is 15360, while the sum is 35.

The square root of 1388285 is about 1178.2550657646. The cubic root of 1388285 is about 111.5559854780. Note that the first 3 decimals are identical.

The spelling of 1388285 in words is "one million, three hundred eighty-eight thousand, two hundred eighty-five".