1338521 has 2 divisors, whose sum is σ = 1338522. Its totient is φ = 1338520.

The previous prime is 1338517. The next prime is 1338539. The reversal of 1338521 is 1258331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1073296 + 265225 = 1036^2 + 515^2 .

It is a cyclic number.

It is not a de Polignac number, because 1338521 - 2² = 1338517 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1338551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669260 + 669261.

It is an arithmetic number, because the mean of its divisors is an integer number (669261).

2^1338521 is an apocalyptic number.

It is an amenable number.

1338521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338521 is an equidigital number, since it uses as much as digits as its factorization.

1338521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 23.

The square root of 1338521 is about 1156.9446832066. The cubic root of 1338521 is about 110.2068010511.

The spelling of 1338521 in words is "one million, three hundred thirty-eight thousand, five hundred twenty-one".