40217879 has 8 divisors (see below), whose sum is σ = 43922592. Its totient is φ = 36600480.

The previous prime is 40217833. The next prime is 40217909. The reversal of 40217879 is 97871204.

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

It is a cyclic number.

It is not a de Polignac number, because 40217879 - 2²⁴ = 23440663 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 (40217279) 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, 20864 + ... + 22709.

It is an arithmetic number, because the mean of its divisors is an integer number (5490324).

Almost surely, 2^40217879 is an apocalyptic number.

40217879 is a deficient number, since it is larger than the sum of its proper divisors (3704713).

40217879 is a wasteful number, since it uses less digits than its factorization.

40217879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43657.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 40217879 is about 6341.7567755315. The cubic root of 40217879 is about 342.6150117236.

It can be divided in two parts, 402 and 17879, that added together give a palindrome (18281).

The spelling of 40217879 in words is "forty million, two hundred seventeen thousand, eight hundred seventy-nine".