1020389 has 2 divisors, whose sum is σ = 1020390. Its totient is φ = 1020388.

The previous prime is 1020379. The next prime is 1020401. The reversal of 1020389 is 9830201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1020100 + 289 = 1010^2 + 17^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020389 - 2¹⁶ = 954853 is a prime.

It is a super-2 number, since 2×1020389² = 2082387422642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510194 + 510195.

It is an arithmetic number, because the mean of its divisors is an integer number (510195).

2^1020389 is an apocalyptic number.

It is an amenable number.

1020389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020389 is an equidigital number, since it uses as much as digits as its factorization.

1020389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1020389 is about 1010.1430591753. The cubic root of 1020389 is about 100.6750659386.

The spelling of 1020389 in words is "one million, twenty thousand, three hundred eighty-nine".