1388668 has 6 divisors (see below), whose sum is σ = 2430176. Its totient is φ = 694332.

The previous prime is 1388659. The next prime is 1388669. The reversal of 1388668 is 8668831.

It is a self number, because there is not a number n which added to its sum of digits gives 1388668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173580 + ... + 173587.

2^1388668 is an apocalyptic number.

It is an amenable number.

1388668 is a deficient number, since it is larger than the sum of its proper divisors (1041508).

1388668 is a wasteful number, since it uses less digits than its factorization.

1388668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347171 (or 347169 counting only the distinct ones).

The product of its digits is 55296, while the sum is 40.

The square root of 1388668 is about 1178.4175830324. The cubic root of 1388668 is about 111.5662432214.

The spelling of 1388668 in words is "one million, three hundred eighty-eight thousand, six hundred sixty-eight".