38209945 has 4 divisors (see below), whose sum is σ = 45851940. Its totient is φ = 30567952.

The previous prime is 38209943. The next prime is 38209957. The reversal of 38209945 is 54990283.

It is a happy number.

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 13329801 + 24880144 = 3651^2 + 4988^2 .

It is a cyclic number.

It is not a de Polignac number, because 38209945 - 2¹ = 38209943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 38209898 and 38209907.

It is not an unprimeable number, because it can be changed into a prime (38209943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3820990 + ... + 3820999.

It is an arithmetic number, because the mean of its divisors is an integer number (11462985).

Almost surely, 2^38209945 is an apocalyptic number.

It is an amenable number.

38209945 is a deficient number, since it is larger than the sum of its proper divisors (7641995).

38209945 is an equidigital number, since it uses as much as digits as its factorization.

38209945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7641994.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 38209945 is about 6181.4193353954. The cubic root of 38209945 is about 336.8155529864.

The spelling of 38209945 in words is "thirty-eight million, two hundred nine thousand, nine hundred forty-five".