40021717 has 8 divisors (see below), whose sum is σ = 40432896. Its totient is φ = 39612912.

The previous prime is 40021703. The next prime is 40021727. The reversal of 40021717 is 71712004.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40021717 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 (40021727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60963 + ... + 61615.

It is an arithmetic number, because the mean of its divisors is an integer number (5054112).

Almost surely, 2^40021717 is an apocalyptic number.

It is an amenable number.

40021717 is a deficient number, since it is larger than the sum of its proper divisors (411179).

40021717 is a wasteful number, since it uses less digits than its factorization.

40021717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 40021717 is about 6326.2719669644. The cubic root of 40021717 is about 342.0570707171.

The spelling of 40021717 in words is "forty million, twenty-one thousand, seven hundred seventeen".