40217245 has 4 divisors (see below), whose sum is σ = 48260700. Its totient is φ = 32173792.

The previous prime is 40217237. The next prime is 40217249. The reversal of 40217245 is 54271204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6240004 + 33977241 = 2498^2 + 5829^2 .

It is a cyclic number.

It is not a de Polignac number, because 40217245 - 2³ = 40217237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40217249) 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, 4021720 + ... + 4021729.

It is an arithmetic number, because the mean of its divisors is an integer number (12065175).

Almost surely, 2^40217245 is an apocalyptic number.

It is an amenable number.

40217245 is a deficient number, since it is larger than the sum of its proper divisors (8043455).

40217245 is an equidigital number, since it uses as much as digits as its factorization.

40217245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8043454.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 40217245 is about 6341.7067891854. The cubic root of 40217245 is about 342.6132113713.

Adding to 40217245 its reverse (54271204), we get a palindrome (94488449).

The spelling of 40217245 in words is "forty million, two hundred seventeen thousand, two hundred forty-five".