40240213 has 8 divisors (see below), whose sum is σ = 43388856. Its totient is φ = 37099200.

The previous prime is 40240181. The next prime is 40240223. The reversal of 40240213 is 31204204.

It can be written as a sum of positive squares in 4 ways, for example, as 13593969 + 26646244 = 3687^2 + 5162^2 .

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 40240213 - 2⁵ = 40240181 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 (40240223) 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, 14043 + ... + 16663.

It is an arithmetic number, because the mean of its divisors is an integer number (5423607).

Almost surely, 2^40240213 is an apocalyptic number.

It is an amenable number.

40240213 is a deficient number, since it is larger than the sum of its proper divisors (3148643).

40240213 is a wasteful number, since it uses less digits than its factorization.

40240213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3815.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 40240213 is about 6343.5173996766. The cubic root of 40240213 is about 342.6784208993.

Adding to 40240213 its reverse (31204204), we get a palindrome (71444417).

The spelling of 40240213 in words is "forty million, two hundred forty thousand, two hundred thirteen".