40449813 has 8 divisors (see below), whose sum is σ = 54207648. Its totient is φ = 26829264.

The previous prime is 40449743. The next prime is 40449833. The reversal of 40449813 is 31894404.

It is a happy number.

40449813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40449813 - 2²⁵ = 6895381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40449833) 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 7 ways as a sum of consecutive naturals, for example, 33631 + ... + 34812.

It is an arithmetic number, because the mean of its divisors is an integer number (6775956).

Almost surely, 2^40449813 is an apocalyptic number.

It is an amenable number.

40449813 is a deficient number, since it is larger than the sum of its proper divisors (13757835).

40449813 is a wasteful number, since it uses less digits than its factorization.

40449813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68643.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 40449813 is about 6360.0167452610. The cubic root of 40449813 is about 343.2723628392.

The spelling of 40449813 in words is "forty million, four hundred forty-nine thousand, eight hundred thirteen".