40205657 has 2 divisors, whose sum is σ = 40205658. Its totient is φ = 40205656.

The previous prime is 40205651. The next prime is 40205701. The reversal of 40205657 is 75650204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20394256 + 19811401 = 4516^2 + 4451^2 .

It is a cyclic number.

It is not a de Polignac number, because 40205657 - 2⁶ = 40205593 is a prime.

It is not a weakly prime, because it can be changed into another prime (40205651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20102828 + 20102829.

It is an arithmetic number, because the mean of its divisors is an integer number (20102829).

Almost surely, 2^40205657 is an apocalyptic number.

It is an amenable number.

40205657 is a deficient number, since it is larger than the sum of its proper divisors (1).

40205657 is an equidigital number, since it uses as much as digits as its factorization.

40205657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 40205657 is about 6340.7930891963. The cubic root of 40205657 is about 342.5803019127.

The spelling of 40205657 in words is "forty million, two hundred five thousand, six hundred fifty-seven".