40027681 has 2 divisors, whose sum is σ = 40027682. Its totient is φ = 40027680.

The previous prime is 40027657. The next prime is 40027697. The reversal of 40027681 is 18672004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33350625 + 6677056 = 5775^2 + 2584^2 .

It is a cyclic number.

It is not a de Polignac number, because 40027681 - 2¹³ = 40019489 is a prime.

It is a super-2 number, since 2×40027681² = 3204430492475522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40027601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20013840 + 20013841.

It is an arithmetic number, because the mean of its divisors is an integer number (20013841).

Almost surely, 2^40027681 is an apocalyptic number.

It is an amenable number.

40027681 is a deficient number, since it is larger than the sum of its proper divisors (1).

40027681 is an equidigital number, since it uses as much as digits as its factorization.

40027681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 40027681 is about 6326.7433170629. The cubic root of 40027681 is about 342.0740608847.

Adding to 40027681 its reverse (18672004), we get a palindrome (58699685).

The spelling of 40027681 in words is "forty million, twenty-seven thousand, six hundred eighty-one".