40431213 has 6 divisors (see below), whose sum is σ = 58400654. Its totient is φ = 26954136.

The previous prime is 40431199. The next prime is 40431241. The reversal of 40431213 is 31213404.

It can be written as a sum of positive squares in only one way, i.e., 39917124 + 514089 = 6318^2 + 717^2 .

It is not a de Polignac number, because 40431213 - 2⁹ = 40430701 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 (40431283) 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, 2246170 + ... + 2246187.

Almost surely, 2^40431213 is an apocalyptic number.

It is an amenable number.

40431213 is a deficient number, since it is larger than the sum of its proper divisors (17969441).

40431213 is a wasteful number, since it uses less digits than its factorization.

40431213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4492363 (or 4492360 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 40431213 is about 6358.5543168239. The cubic root of 40431213 is about 343.2197392350.

Adding to 40431213 its reverse (31213404), we get a palindrome (71644617).

The spelling of 40431213 in words is "forty million, four hundred thirty-one thousand, two hundred thirteen".