40348681 has 2 divisors, whose sum is σ = 40348682. Its totient is φ = 40348680.

The previous prime is 40348669. The next prime is 40348687. The reversal of 40348681 is 18684304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26173456 + 14175225 = 5116^2 + 3765^2 .

It is a cyclic number.

It is not a de Polignac number, because 40348681 - 2⁹ = 40348169 is a prime.

It is a super-2 number, since 2×40348681² = 3256032116879522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40348687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20174340 + 20174341.

It is an arithmetic number, because the mean of its divisors is an integer number (20174341).

Almost surely, 2^40348681 is an apocalyptic number.

It is an amenable number.

40348681 is a deficient number, since it is larger than the sum of its proper divisors (1).

40348681 is an equidigital number, since it uses as much as digits as its factorization.

40348681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 40348681 is about 6352.0611615443. The cubic root of 40348681 is about 342.9860426623.

The spelling of 40348681 in words is "forty million, three hundred forty-eight thousand, six hundred eighty-one".