1388680 has 32 divisors (see below), whose sum is σ = 3159000. Its totient is φ = 549376.

The previous prime is 1388669. The next prime is 1388687. The reversal of 1388680 is 868831.

It can be written as a sum of positive squares in 4 ways, for example, as 617796 + 770884 = 786^2 + 878^2 .

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, 5844 + ... + 6076.

2^1388680 is an apocalyptic number.

1388680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1388680 is an abundant number, since it is smaller than the sum of its proper divisors (1770320).

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

1388680 is a wasteful number, since it uses less digits than its factorization.

1388680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 1388680 is about 1178.4226745952. The cubic root of 1388680 is about 111.5665645824.

The spelling of 1388680 in words is "one million, three hundred eighty-eight thousand, six hundred eighty".