40724217 has 6 divisors (see below), whose sum is σ = 58823882. Its totient is φ = 27149472.

The previous prime is 40724171. The next prime is 40724227. The reversal of 40724217 is 71242704.

It is a happy number.

40724217 is a `hidden beast` number, since 407 + 242 + 17 = 666.

It can be written as a sum of positive squares in only one way, i.e., 40717161 + 7056 = 6381^2 + 84^2 .

It is not a de Polignac number, because 40724217 - 2⁶ = 40724153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40724227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2262448 + ... + 2262465.

Almost surely, 2^40724217 is an apocalyptic number.

It is an amenable number.

40724217 is a deficient number, since it is larger than the sum of its proper divisors (18099665).

40724217 is a wasteful number, since it uses less digits than its factorization.

40724217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4524919 (or 4524916 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 40724217 is about 6381.5528674454. The cubic root of 40724217 is about 344.0468460855.

The spelling of 40724217 in words is "forty million, seven hundred twenty-four thousand, two hundred seventeen".