1389028 has 6 divisors (see below), whose sum is σ = 2430806. Its totient is φ = 694512.

The previous prime is 1389007. The next prime is 1389083. The reversal of 1389028 is 8209831.

It can be written as a sum of positive squares in only one way, i.e., 736164 + 652864 = 858^2 + 808^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173625 + ... + 173632.

2^1389028 is an apocalyptic number.

It is an amenable number.

1389028 is a deficient number, since it is larger than the sum of its proper divisors (1041778).

1389028 is a wasteful number, since it uses less digits than its factorization.

1389028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347261 (or 347259 counting only the distinct ones).

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

The square root of 1389028 is about 1178.5703203458. The cubic root of 1389028 is about 111.5758832451.

The spelling of 1389028 in words is "one million, three hundred eighty-nine thousand, twenty-eight".