1388755 has 4 divisors (see below), whose sum is σ = 1666512. Its totient is φ = 1111000.

The previous prime is 1388743. The next prime is 1388773. The reversal of 1388755 is 5578831.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1388755 - 2⁷ = 1388627 is a prime.

It is a Duffinian number.

1388755 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138871 + ... + 138880.

It is an arithmetic number, because the mean of its divisors is an integer number (416628).

2^1388755 is an apocalyptic number.

1388755 is a deficient number, since it is larger than the sum of its proper divisors (277757).

1388755 is an equidigital number, since it uses as much as digits as its factorization.

1388755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277756.

The product of its digits is 33600, while the sum is 37.

The square root of 1388755 is about 1178.4544963638. The cubic root of 1388755 is about 111.5685730465.

The spelling of 1388755 in words is "one million, three hundred eighty-eight thousand, seven hundred fifty-five".