1388129 has 4 divisors (see below), whose sum is σ = 1425684. Its totient is φ = 1350576.

The previous prime is 1388117. The next prime is 1388141. The reversal of 1388129 is 9218831.

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

It is an interprime number because it is at equal distance from previous prime (1388117) and next prime (1388141).

It can be written as a sum of positive squares in 2 ways, for example, as 1000000 + 388129 = 1000^2 + 623^2 .

It is a cyclic number.

It is not a de Polignac number, because 1388129 - 2⁴ = 1388113 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1388095 and 1388104.

It is not an unprimeable number, because it can be changed into a prime (1388029) 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, 18722 + ... + 18795.

It is an arithmetic number, because the mean of its divisors is an integer number (356421).

2^1388129 is an apocalyptic number.

It is an amenable number.

1388129 is a deficient number, since it is larger than the sum of its proper divisors (37555).

1388129 is an equidigital number, since it uses as much as digits as its factorization.

1388129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37554.

The product of its digits is 3456, while the sum is 32.

The square root of 1388129 is about 1178.1888643168. The cubic root of 1388129 is about 111.5518068486.

The spelling of 1388129 in words is "one million, three hundred eighty-eight thousand, one hundred twenty-nine".