1356389 has 2 divisors, whose sum is σ = 1356390. Its totient is φ = 1356388.

The previous prime is 1356371. The next prime is 1356401. The reversal of 1356389 is 9836531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 688900 + 667489 = 830^2 + 817^2 .

It is a cyclic number.

It is not a de Polignac number, because 1356389 - 2⁸ = 1356133 is a prime.

It is a super-2 number, since 2×1356389² = 3679582238642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1356319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678194 + 678195.

It is an arithmetic number, because the mean of its divisors is an integer number (678195).

2^1356389 is an apocalyptic number.

It is an amenable number.

1356389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1356389 is an equidigital number, since it uses as much as digits as its factorization.

1356389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 35.

The square root of 1356389 is about 1164.6411464481. The cubic root of 1356389 is about 110.6950208391.

The spelling of 1356389 in words is "one million, three hundred fifty-six thousand, three hundred eighty-nine".