40635649 has 2 divisors, whose sum is σ = 40635650. Its totient is φ = 40635648.

The previous prime is 40635631. The next prime is 40635653. The reversal of 40635649 is 94653604.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26625600 + 14010049 = 5160^2 + 3743^2 .

It is a cyclic number.

It is not a de Polignac number, because 40635649 - 2⁹ = 40635137 is a prime.

It is equal to p_2469916 and since 40635649 and 2469916 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (40635619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20317824 + 20317825.

It is an arithmetic number, because the mean of its divisors is an integer number (20317825).

Almost surely, 2^40635649 is an apocalyptic number.

It is an amenable number.

40635649 is a deficient number, since it is larger than the sum of its proper divisors (1).

40635649 is an equidigital number, since it uses as much as digits as its factorization.

40635649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 40635649 is about 6374.6097135433. The cubic root of 40635649 is about 343.7972512897.

The spelling of 40635649 in words is "forty million, six hundred thirty-five thousand, six hundred forty-nine".