1338661 has 2 divisors, whose sum is σ = 1338662. Its totient is φ = 1338660.

The previous prime is 1338653. The next prime is 1338671. The reversal of 1338661 is 1668331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 776161 + 562500 = 881^2 + 750^2 .

It is a cyclic number.

It is not a de Polignac number, because 1338661 - 2³ = 1338653 is a prime.

It is a Chen prime.

1338661 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1338641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669330 + 669331.

It is an arithmetic number, because the mean of its divisors is an integer number (669331).

2^1338661 is an apocalyptic number.

It is an amenable number.

1338661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338661 is an equidigital number, since it uses as much as digits as its factorization.

1338661 is an evil number, because the sum of its binary digits is even.

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

The square root of 1338661 is about 1157.0051858138. The cubic root of 1338661 is about 110.2106432058.

The spelling of 1338661 in words is "one million, three hundred thirty-eight thousand, six hundred sixty-one".