40105217 has 4 divisors (see below), whose sum is σ = 40345536. Its totient is φ = 39864900.

The previous prime is 40105211. The next prime is 40105229. The reversal of 40105217 is 71250104.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40105217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40105211) 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, 119909 + ... + 120242.

It is an arithmetic number, because the mean of its divisors is an integer number (10086384).

Almost surely, 2^40105217 is an apocalyptic number.

It is an amenable number.

40105217 is a deficient number, since it is larger than the sum of its proper divisors (240319).

40105217 is a wasteful number, since it uses less digits than its factorization.

40105217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240318.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 40105217 is about 6332.8679916764. The cubic root of 40105217 is about 342.2947910274.

The spelling of 40105217 in words is "forty million, one hundred five thousand, two hundred seventeen".