1388028 has 24 divisors (see below), whose sum is σ = 3273088. Its totient is φ = 457776.

The previous prime is 1388021. The next prime is 1388029. The reversal of 1388028 is 8208831.

It is a junction number, because it is equal to n+sod(n) for n = 1387986 and 1388004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 675 + ... + 1797.

2^1388028 is an apocalyptic number.

It is an amenable number.

1388028 is an abundant number, since it is smaller than the sum of its proper divisors (1885060).

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

1388028 is a wasteful number, since it uses less digits than its factorization.

1388028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233 (or 1231 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 1388028 is about 1178.1460011391. The cubic root of 1388028 is about 111.5491012869.

The spelling of 1388028 in words is "one million, three hundred eighty-eight thousand, twenty-eight".