38721281 has 2 divisors, whose sum is σ = 38721282. Its totient is φ = 38721280.

The previous prime is 38721271. The next prime is 38721299. The reversal of 38721281 is 18212783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24167056 + 14554225 = 4916^2 + 3815^2 .

It is a cyclic number.

It is not a de Polignac number, because 38721281 - 2¹⁸ = 38459137 is a prime.

It is a super-2 number, since 2×38721281² = 2998675204561922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (38721211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19360640 + 19360641.

It is an arithmetic number, because the mean of its divisors is an integer number (19360641).

Almost surely, 2^38721281 is an apocalyptic number.

It is an amenable number.

38721281 is a deficient number, since it is larger than the sum of its proper divisors (1).

38721281 is an equidigital number, since it uses as much as digits as its factorization.

38721281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 32.

The square root of 38721281 is about 6222.6426058388. The cubic root of 38721281 is about 338.3113531036.

The spelling of 38721281 in words is "thirty-eight million, seven hundred twenty-one thousand, two hundred eighty-one".