38197021 has 2 divisors, whose sum is σ = 38197022. Its totient is φ = 38197020.

The previous prime is 38197009. The next prime is 38197057. The reversal of 38197021 is 12079183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23863225 + 14333796 = 4885^2 + 3786^2 .

It is a cyclic number.

It is not a de Polignac number, because 38197021 - 2¹⁵ = 38164253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38197091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19098510 + 19098511.

It is an arithmetic number, because the mean of its divisors is an integer number (19098511).

Almost surely, 2^38197021 is an apocalyptic number.

It is an amenable number.

38197021 is a deficient number, since it is larger than the sum of its proper divisors (1).

38197021 is an equidigital number, since it uses as much as digits as its factorization.

38197021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 38197021 is about 6180.3738560058. The cubic root of 38197021 is about 336.7775742606. Note that the first 3 decimals are identical.

The spelling of 38197021 in words is "thirty-eight million, one hundred ninety-seven thousand, twenty-one".