1380688 has 10 divisors (see below), whose sum is σ = 2675114. Its totient is φ = 690336.

The previous prime is 1380679. The next prime is 1380707. The reversal of 1380688 is 8860831.

It can be written as a sum of positive squares in only one way, i.e., 753424 + 627264 = 868^2 + 792^2 .

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 43131 + ... + 43162.

2^1380688 is an apocalyptic number.

It is an amenable number.

1380688 is a deficient number, since it is larger than the sum of its proper divisors (1294426).

1380688 is an equidigital number, since it uses as much as digits as its factorization.

1380688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86301 (or 86295 counting only the distinct ones).

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

The square root of 1380688 is about 1175.0268082048. The cubic root of 1380688 is about 111.3521268986.

It can be divided in two parts, 1 and 380688, that added together give a square (380689 = 617²).

The spelling of 1380688 in words is "one million, three hundred eighty thousand, six hundred eighty-eight".