40997491 has 4 divisors (see below), whose sum is σ = 41020000. Its totient is φ = 40974984.

The previous prime is 40997471. The next prime is 40997513. The reversal of 40997491 is 19479904.

40997491 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40997491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40997471) 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, 8256 + ... + 12253.

It is an arithmetic number, because the mean of its divisors is an integer number (10255000).

Almost surely, 2^40997491 is an apocalyptic number.

40997491 is a deficient number, since it is larger than the sum of its proper divisors (22509).

40997491 is a wasteful number, since it uses less digits than its factorization.

40997491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22508.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 40997491 is about 6402.9283144511. The cubic root of 40997491 is about 344.8146900923.

The spelling of 40997491 in words is "forty million, nine hundred ninety-seven thousand, four hundred ninety-one".