1339909 has 2 divisors, whose sum is σ = 1339910. Its totient is φ = 1339908.

The previous prime is 1339907. The next prime is 1339931. The reversal of 1339909 is 9099331.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 675684 + 664225 = 822^2 + 815^2 .

It is an emirp because it is prime and its reverse (9099331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1339909 - 2¹ = 1339907 is a prime.

It is a super-2 number, since 2×1339909² = 3590712256562, which contains 22 as substring.

Together with 1339907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1339901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669954 + 669955.

It is an arithmetic number, because the mean of its divisors is an integer number (669955).

2^1339909 is an apocalyptic number.

It is an amenable number.

1339909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1339909 is an equidigital number, since it uses as much as digits as its factorization.

1339909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6561, while the sum is 34.

The square root of 1339909 is about 1157.5443835983. The cubic root of 1339909 is about 110.2448814389.

The spelling of 1339909 in words is "one million, three hundred thirty-nine thousand, nine hundred nine".