1388788 has 6 divisors (see below), whose sum is σ = 2430386. Its totient is φ = 694392.

The previous prime is 1388773. The next prime is 1388789. The reversal of 1388788 is 8878831.

It can be written as a sum of positive squares in only one way, i.e., 1205604 + 183184 = 1098^2 + 428^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173595 + ... + 173602.

2^1388788 is an apocalyptic number.

It is an amenable number.

1388788 is a deficient number, since it is larger than the sum of its proper divisors (1041598).

1388788 is a wasteful number, since it uses less digits than its factorization.

1388788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347201 (or 347199 counting only the distinct ones).

The product of its digits is 86016, while the sum is 43.

The square root of 1388788 is about 1178.4684976698. The cubic root of 1388788 is about 111.5694567478.

Adding to 1388788 its sum of digits (43), we get a palindrome (1388831).

The spelling of 1388788 in words is "one million, three hundred eighty-eight thousand, seven hundred eighty-eight".