1388865 has 16 divisors (see below), whose sum is σ = 2265408. Its totient is φ = 726336.

The previous prime is 1388837. The next prime is 1388873. The reversal of 1388865 is 5688831.

It is a happy number.

It is not a de Polignac number, because 1388865 - 2⁹ = 1388353 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79 + ... + 1668.

It is an arithmetic number, because the mean of its divisors is an integer number (141588).

2^1388865 is an apocalyptic number.

1388865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1388865 is a deficient number, since it is larger than the sum of its proper divisors (876543).

1388865 is a wasteful number, since it uses less digits than its factorization.

1388865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808.

The product of its digits is 46080, while the sum is 39.

The square root of 1388865 is about 1178.5011667368. The cubic root of 1388865 is about 111.5715186630.

The spelling of 1388865 in words is "one million, three hundred eighty-eight thousand, eight hundred sixty-five".