1389403 has 2 divisors, whose sum is σ = 1389404. Its totient is φ = 1389402.

The previous prime is 1389383. The next prime is 1389431. The reversal of 1389403 is 3049831.

It is an a-pointer prime, because the next prime (1389431) can be obtained adding 1389403 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1389403 - 2⁵ = 1389371 is a prime.

1389403 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1389433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694701 + 694702.

It is an arithmetic number, because the mean of its divisors is an integer number (694702).

2^1389403 is an apocalyptic number.

1389403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389403 is an equidigital number, since it uses as much as digits as its factorization.

1389403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1389403 is about 1178.7294006684. The cubic root of 1389403 is about 111.5859231655.

The spelling of 1389403 in words is "one million, three hundred eighty-nine thousand, four hundred three".