40257641 has 2 divisors, whose sum is σ = 40257642. Its totient is φ = 40257640.

The previous prime is 40257631. The next prime is 40257667. The reversal of 40257641 is 14675204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35952016 + 4305625 = 5996^2 + 2075^2 .

It is a cyclic number.

It is not a de Polignac number, because 40257641 - 2¹⁰ = 40256617 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40257601) 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, 20128820 + 20128821.

It is an arithmetic number, because the mean of its divisors is an integer number (20128821).

Almost surely, 2^40257641 is an apocalyptic number.

It is an amenable number.

40257641 is a deficient number, since it is larger than the sum of its proper divisors (1).

40257641 is an equidigital number, since it uses as much as digits as its factorization.

40257641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 40257641 is about 6344.8909368089. The cubic root of 40257641 is about 342.7278849975.

The spelling of 40257641 in words is "forty million, two hundred fifty-seven thousand, six hundred forty-one".