40280213 has 4 divisors (see below), whose sum is σ = 40550700. Its totient is φ = 40009728.

The previous prime is 40280203. The next prime is 40280221. The reversal of 40280213 is 31208204.

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 19695844 + 20584369 = 4438^2 + 4537^2 .

It is a cyclic number.

It is not a de Polignac number, because 40280213 - 2¹⁴ = 40263829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40280203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135020 + ... + 135317.

It is an arithmetic number, because the mean of its divisors is an integer number (10137675).

Almost surely, 2^40280213 is an apocalyptic number.

It is an amenable number.

40280213 is a deficient number, since it is larger than the sum of its proper divisors (270487).

40280213 is a wasteful number, since it uses less digits than its factorization.

40280213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270486.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 40280213 is about 6346.6694415260. The cubic root of 40280213 is about 342.7919275680.

Adding to 40280213 its reverse (31208204), we get a palindrome (71488417).

The spelling of 40280213 in words is "forty million, two hundred eighty thousand, two hundred thirteen".