1388809 has 4 divisors (see below), whose sum is σ = 1449216. Its totient is φ = 1328404.

The previous prime is 1388797. The next prime is 1388819. The reversal of 1388809 is 9088831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1388809 - 2⁹ = 1388297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1388819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30169 + ... + 30214.

It is an arithmetic number, because the mean of its divisors is an integer number (362304).

2^1388809 is an apocalyptic number.

It is an amenable number.

1388809 is a deficient number, since it is larger than the sum of its proper divisors (60407).

1388809 is an equidigital number, since it uses as much as digits as its factorization.

1388809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60406.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 1388809 is about 1178.4774075051. The cubic root of 1388809 is about 111.5700190958.

It can be divided in two parts, 1388 and 809, that added together give a cube (2197 = 13³).

The spelling of 1388809 in words is "one million, three hundred eighty-eight thousand, eight hundred nine".