1388565 has 24 divisors (see below), whose sum is σ = 2452320. Its totient is φ = 726624.

The previous prime is 1388483. The next prime is 1388587. The reversal of 1388565 is 5658831.

1388565 is a `hidden beast` number, since 13 + 88 + 565 = 666.

It is not a de Polignac number, because 1388565 - 2⁹ = 1388053 is a prime.

It is a super-2 number, since 2×1388565² = 3856225518450, which contains 22 as substring.

1388565 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2394 + ... + 2916.

It is an arithmetic number, because the mean of its divisors is an integer number (102180).

2^1388565 is an apocalyptic number.

1388565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1388565 is a deficient number, since it is larger than the sum of its proper divisors (1063755).

1388565 is a wasteful number, since it uses less digits than its factorization.

1388565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593 (or 590 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 1388565 is about 1178.3738795476. The cubic root of 1388565 is about 111.5634847970.

It can be divided in two parts, 1388 and 565, that added together give a triangular number (1953 = T₆₂).

The spelling of 1388565 in words is "one million, three hundred eighty-eight thousand, five hundred sixty-five".