40287281 has 2 divisors, whose sum is σ = 40287282. Its totient is φ = 40287280.

The previous prime is 40287271. The next prime is 40287307. The reversal of 40287281 is 18278204.

40287281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24167056 + 16120225 = 4916^2 + 4015^2 .

It is a cyclic number.

It is not a de Polignac number, because 40287281 - 2²² = 36092977 is a prime.

It is a super-2 number, since 2×40287281² = 3246130020745922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40287241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20143640 + 20143641.

It is an arithmetic number, because the mean of its divisors is an integer number (20143641).

Almost surely, 2^40287281 is an apocalyptic number.

It is an amenable number.

40287281 is a deficient number, since it is larger than the sum of its proper divisors (1).

40287281 is an equidigital number, since it uses as much as digits as its factorization.

40287281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 40287281 is about 6347.2262445890. The cubic root of 40287281 is about 342.8119763832.

The spelling of 40287281 in words is "forty million, two hundred eighty-seven thousand, two hundred eighty-one".