40143641 has 2 divisors, whose sum is σ = 40143642. Its totient is φ = 40143640.

The previous prime is 40143629. The next prime is 40143661. The reversal of 40143641 is 14634104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39740416 + 403225 = 6304^2 + 635^2 .

It is a cyclic number.

It is not a de Polignac number, because 40143641 - 2⁶ = 40143577 is a prime.

It is a super-2 number, since 2×40143641² = 3223023825473762, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40143601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20071820 + 20071821.

It is an arithmetic number, because the mean of its divisors is an integer number (20071821).

Almost surely, 2^40143641 is an apocalyptic number.

It is an amenable number.

40143641 is a deficient number, since it is larger than the sum of its proper divisors (1).

40143641 is an equidigital number, since it uses as much as digits as its factorization.

40143641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 40143641 is about 6335.9009619785. The cubic root of 40143641 is about 342.4040713816.

Adding to 40143641 its reverse (14634104), we get a palindrome (54777745).

The spelling of 40143641 in words is "forty million, one hundred forty-three thousand, six hundred forty-one".