1380928 has 14 divisors (see below), whose sum is σ = 2740406. Its totient is φ = 690432.

The previous prime is 1380913. The next prime is 1380931. The reversal of 1380928 is 8290831.

It can be written as a sum of positive squares in only one way, i.e., 1327104 + 53824 = 1152^2 + 232^2 .

It is an Ulam number.

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 1380928.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725 + ... + 10852.

2^1380928 is an apocalyptic number.

It is an amenable number.

1380928 is a deficient number, since it is larger than the sum of its proper divisors (1359478).

1380928 is an equidigital number, since it uses as much as digits as its factorization.

1380928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21589 (or 21579 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1380928 is about 1175.1289290967. The cubic root of 1380928 is about 111.3585785039.

Subtracting 1380928 from its reverse (8290831), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 1380928 in words is "one million, three hundred eighty thousand, nine hundred twenty-eight".