938441909 has 4 divisors (see below), whose sum is σ = 944419404. Its totient is φ = 932464416.

The previous prime is 938441891. The next prime is 938441953. The reversal of 938441909 is 909144839.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 199798225 + 738643684 = 14135^2 + 27178^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-938441909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (938441969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2988512 + ... + 2988825.

It is an arithmetic number, because the mean of its divisors is an integer number (236104851).

Almost surely, 2^938441909 is an apocalyptic number.

It is an amenable number.

938441909 is a deficient number, since it is larger than the sum of its proper divisors (5977495).

938441909 is a wasteful number, since it uses less digits than its factorization.

938441909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5977494.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 938441909 is about 30633.9992328785. Note that the first 3 decimals coincide. The cubic root of 938441909 is about 979.0445738321.

Adding to 938441909 its sum of digits (47), we get a square (938441956 = 30634²).

The spelling of 938441909 in words is "nine hundred thirty-eight million, four hundred forty-one thousand, nine hundred nine".