40643517 has 4 divisors (see below), whose sum is σ = 54191360. Its totient is φ = 27095676.

The previous prime is 40643509. The next prime is 40643531. The reversal of 40643517 is 71534604.

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 not a de Polignac number, because 40643517 - 2³ = 40643509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40643597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6773917 + ... + 6773922.

It is an arithmetic number, because the mean of its divisors is an integer number (13547840).

Almost surely, 2^40643517 is an apocalyptic number.

It is an amenable number.

40643517 is a deficient number, since it is larger than the sum of its proper divisors (13547843).

40643517 is a wasteful number, since it uses less digits than its factorization.

40643517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13547842.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 40643517 is about 6375.2268194943. The cubic root of 40643517 is about 343.8194388867.

The spelling of 40643517 in words is "forty million, six hundred forty-three thousand, five hundred seventeen".