40261643 has 2 divisors, whose sum is σ = 40261644. Its totient is φ = 40261642.

The previous prime is 40261621. The next prime is 40261651. The reversal of 40261643 is 34616204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40261643 - 2⁶ = 40261579 is a prime.

It is not a weakly prime, because it can be changed into another prime (40261043) 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, 20130821 + 20130822.

It is an arithmetic number, because the mean of its divisors is an integer number (20130822).

Almost surely, 2^40261643 is an apocalyptic number.

40261643 is a deficient number, since it is larger than the sum of its proper divisors (1).

40261643 is an equidigital number, since it uses as much as digits as its factorization.

40261643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 40261643 is about 6345.2063008227. The cubic root of 40261643 is about 342.7392414466.

Adding to 40261643 its reverse (34616204), we get a palindrome (74877847).

It can be divided in two parts, 40261 and 643, that added together give a palindrome (40904).

The spelling of 40261643 in words is "forty million, two hundred sixty-one thousand, six hundred forty-three".