1439909 has 2 divisors, whose sum is σ = 1439910. Its totient is φ = 1439908.

The previous prime is 1439903. The next prime is 1439927. The reversal of 1439909 is 9099341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 722500 + 717409 = 850^2 + 847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1439909 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1439903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719954 + 719955.

It is an arithmetic number, because the mean of its divisors is an integer number (719955).

2^1439909 is an apocalyptic number.

It is an amenable number.

1439909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1439909 is an equidigital number, since it uses as much as digits as its factorization.

1439909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 1439909 is about 1199.9620827343. The cubic root of 1439909 is about 112.9219446857.

The spelling of 1439909 in words is "one million, four hundred thirty-nine thousand, nine hundred nine".