1388257 has 8 divisors (see below), whose sum is σ = 1560384. Its totient is φ = 1225488.

The previous prime is 1388243. The next prime is 1388269. The reversal of 1388257 is 7528831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1388257 is a prime.

It is a Duffinian number.

1388257 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1388227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2023 + ... + 2620.

It is an arithmetic number, because the mean of its divisors is an integer number (195048).

2^1388257 is an apocalyptic number.

It is an amenable number.

1388257 is a deficient number, since it is larger than the sum of its proper divisors (172127).

1388257 is a wasteful number, since it uses less digits than its factorization.

1388257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4679.

The product of its digits is 13440, while the sum is 34.

The square root of 1388257 is about 1178.2431837274. The cubic root of 1388257 is about 111.5552354906. Note that the first 3 decimals are identical.

The spelling of 1388257 in words is "one million, three hundred eighty-eight thousand, two hundred fifty-seven".