38818321 has 2 divisors, whose sum is σ = 38818322. Its totient is φ = 38818320.

The previous prime is 38818301. The next prime is 38818357. The reversal of 38818321 is 12381883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37075921 + 1742400 = 6089^2 + 1320^2 .

It is an emirp because it is prime and its reverse (12381883) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38818321 - 2⁹ = 38817809 is a prime.

It is not a weakly prime, because it can be changed into another prime (38818301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19409160 + 19409161.

It is an arithmetic number, because the mean of its divisors is an integer number (19409161).

Almost surely, 2^38818321 is an apocalyptic number.

It is an amenable number.

38818321 is a deficient number, since it is larger than the sum of its proper divisors (1).

38818321 is an equidigital number, since it uses as much as digits as its factorization.

38818321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 34.

The square root of 38818321 is about 6230.4350570406. The cubic root of 38818321 is about 338.5937331105.

The spelling of 38818321 in words is "thirty-eight million, eight hundred eighteen thousand, three hundred twenty-one".