38642209 has 2 divisors, whose sum is σ = 38642210. Its totient is φ = 38642208.

The previous prime is 38642189. The next prime is 38642221. The reversal of 38642209 is 90224683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32809984 + 5832225 = 5728^2 + 2415^2 .

It is an emirp because it is prime and its reverse (90224683) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38642209 - 2⁷ = 38642081 is a prime.

It is not a weakly prime, because it can be changed into another prime (38642269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19321104 + 19321105.

It is an arithmetic number, because the mean of its divisors is an integer number (19321105).

Almost surely, 2^38642209 is an apocalyptic number.

It is an amenable number.

38642209 is a deficient number, since it is larger than the sum of its proper divisors (1).

38642209 is an equidigital number, since it uses as much as digits as its factorization.

38642209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 38642209 is about 6216.2857881536. The cubic root of 38642209 is about 338.0809097529.

The spelling of 38642209 in words is "thirty-eight million, six hundred forty-two thousand, two hundred nine".