40641997 has 4 divisors (see below), whose sum is σ = 44336736. Its totient is φ = 36947260.

The previous prime is 40641983. The next prime is 40642001. The reversal of 40641997 is 79914604.

It is a happy number.

40641997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40641997 - 2⁷ = 40641869 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40641907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1847353 + ... + 1847374.

It is an arithmetic number, because the mean of its divisors is an integer number (11084184).

Almost surely, 2^40641997 is an apocalyptic number.

It is an amenable number.

40641997 is a deficient number, since it is larger than the sum of its proper divisors (3694739).

40641997 is a wasteful number, since it uses less digits than its factorization.

40641997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3694738.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 40641997 is about 6375.1076069350. The cubic root of 40641997 is about 343.8151527414.

The spelling of 40641997 in words is "forty million, six hundred forty-one thousand, nine hundred ninety-seven".