1388688 has 40 divisors (see below), whose sum is σ = 4100928. Its totient is φ = 396672.

The previous prime is 1388687. The next prime is 1388693. The reversal of 1388688 is 8868831.

It is a happy number.

It is a super-2 number, since 2×1388688² = 3856908722688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1388687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1731 + ... + 2402.

2^1388688 is an apocalyptic number.

It is an amenable number.

1388688 is an abundant number, since it is smaller than the sum of its proper divisors (2712240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1388688 is a wasteful number, since it uses less digits than its factorization.

1388688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4151 (or 4145 counting only the distinct ones).

The product of its digits is 73728, while the sum is 42.

The square root of 1388688 is about 1178.4260689581. The cubic root of 1388688 is about 111.5667788220.

The spelling of 1388688 in words is "one million, three hundred eighty-eight thousand, six hundred eighty-eight".