402440213 has 4 divisors (see below), whose sum is σ = 459931680. Its totient is φ = 344948748.

The previous prime is 402440189. The next prime is 402440219. The reversal of 402440213 is 312044204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 402440213 - 2¹⁴ = 402423829 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 (402440219) 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, 28745723 + ... + 28745736.

It is an arithmetic number, because the mean of its divisors is an integer number (114982920).

Almost surely, 2^402440213 is an apocalyptic number.

It is an amenable number.

402440213 is a deficient number, since it is larger than the sum of its proper divisors (57491467).

402440213 is an equidigital number, since it uses as much as digits as its factorization.

402440213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57491466.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 402440213 is about 20060.9125664811. The cubic root of 402440213 is about 738.3015667885.

Adding to 402440213 its reverse (312044204), we get a palindrome (714484417).

The spelling of 402440213 in words is "four hundred two million, four hundred forty thousand, two hundred thirteen".