40557709 has 2 divisors, whose sum is σ = 40557710. Its totient is φ = 40557708.

The previous prime is 40557683. The next prime is 40557719. The reversal of 40557709 is 90775504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34257609 + 6300100 = 5853^2 + 2510^2 .

It is a cyclic number.

It is not a de Polignac number, because 40557709 - 2⁵ = 40557677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40557719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20278854 + 20278855.

It is an arithmetic number, because the mean of its divisors is an integer number (20278855).

Almost surely, 2^40557709 is an apocalyptic number.

It is an amenable number.

40557709 is a deficient number, since it is larger than the sum of its proper divisors (1).

40557709 is an equidigital number, since it uses as much as digits as its factorization.

40557709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44100, while the sum is 37.

The square root of 40557709 is about 6368.4934639206. The cubic root of 40557709 is about 343.5773072408.

The spelling of 40557709 in words is "forty million, five hundred fifty-seven thousand, seven hundred nine".