1388231 has 4 divisors (see below), whose sum is σ = 1495032. Its totient is φ = 1281432.

The previous prime is 1388227. The next prime is 1388243. The reversal of 1388231 is 1328831.

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

It is a cyclic number.

It is not a de Polignac number, because 1388231 - 2² = 1388227 is a prime.

It is a super-2 number, since 2×1388231² = 3854370618722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1388231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381231) 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, 53381 + ... + 53406.

It is an arithmetic number, because the mean of its divisors is an integer number (373758).

2^1388231 is an apocalyptic number.

1388231 is a deficient number, since it is larger than the sum of its proper divisors (106801).

1388231 is a wasteful number, since it uses less digits than its factorization.

1388231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106800.

The product of its digits is 1152, while the sum is 26.

The square root of 1388231 is about 1178.2321502998. The cubic root of 1388231 is about 111.5545390648.

The spelling of 1388231 in words is "one million, three hundred eighty-eight thousand, two hundred thirty-one".