1388205 has 64 divisors (see below), whose sum is σ = 3064320. Its totient is φ = 580608.

The previous prime is 1388183. The next prime is 1388227. The reversal of 1388205 is 5028831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1388183) and next prime (1388227).

It is not a de Polignac number, because 1388205 - 2⁶ = 1388141 is a prime.

It is a super-2 number, since 2×1388205² = 3854226244050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12229 + ... + 12341.

It is an arithmetic number, because the mean of its divisors is an integer number (47880).

2^1388205 is an apocalyptic number.

1388205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1388205 is an abundant number, since it is smaller than the sum of its proper divisors (1676115).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1388205 is a wasteful number, since it uses less digits than its factorization.

1388205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 1388205 is about 1178.2211167688. The cubic root of 1388205 is about 111.5538426302.

1388205 divided by its sum of digits (27) gives a palindrome (51415).

The spelling of 1388205 in words is "one million, three hundred eighty-eight thousand, two hundred five".