1388305 has 8 divisors (see below), whose sum is σ = 1764072. Its totient is φ = 1045248.

The previous prime is 1388297. The next prime is 1388323. The reversal of 1388305 is 5038831.

It can be written as a sum of positive squares in 4 ways, for example, as 63504 + 1324801 = 252^2 + 1151^2 .

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 1388305 - 2³ = 1388297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8082 + ... + 8251.

It is an arithmetic number, because the mean of its divisors is an integer number (220509).

2^1388305 is an apocalyptic number.

It is an amenable number.

1388305 is a deficient number, since it is larger than the sum of its proper divisors (375767).

1388305 is a wasteful number, since it uses less digits than its factorization.

1388305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16355.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1388305 is about 1178.2635528607. The cubic root of 1388305 is about 111.5565211771.

The spelling of 1388305 in words is "one million, three hundred eighty-eight thousand, three hundred five".