1385621 has 2 divisors, whose sum is σ = 1385622. Its totient is φ = 1385620.

The previous prime is 1385609. The next prime is 1385647. The reversal of 1385621 is 1265831.

1385621 is nontrivially palindromic in base 2 and base 8.

It is an a-pointer prime, because the next prime (1385647) can be obtained adding 1385621 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 784996 + 600625 = 886^2 + 775^2 .

It is a cyclic number.

It is not a de Polignac number, because 1385621 - 2¹⁸ = 1123477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1385521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 692810 + 692811.

It is an arithmetic number, because the mean of its divisors is an integer number (692811).

2^1385621 is an apocalyptic number.

It is an amenable number.

1385621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1385621 is an equidigital number, since it uses as much as digits as its factorization.

1385621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 26.

The square root of 1385621 is about 1177.1240376443. The cubic root of 1385621 is about 111.4845843274.

The spelling of 1385621 in words is "one million, three hundred eighty-five thousand, six hundred twenty-one".