383909 has 2 divisors, whose sum is σ = 383910. Its totient is φ = 383908.

The previous prime is 383891. The next prime is 383917. The reversal of 383909 is 909383.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 247009 + 136900 = 497^2 + 370^2 .

It is an emirp because it is prime and its reverse (909383) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-383909 is a prime.

It is a super-2 number, since 2×383909² = 294772240562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (383969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191954 + 191955.

It is an arithmetic number, because the mean of its divisors is an integer number (191955).

2³⁸³⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

383909 is a deficient number, since it is larger than the sum of its proper divisors (1).

383909 is an equidigital number, since it uses as much as digits as its factorization.

383909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 383909 is about 619.6039057333. The cubic root of 383909 is about 72.6790816634.

The spelling of 383909 in words is "three hundred eighty-three thousand, nine hundred nine".