402343213 has 2 divisors, whose sum is σ = 402343214. Its totient is φ = 402343212.

The previous prime is 402343189. The next prime is 402343283. The reversal of 402343213 is 312343204.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 321018889 + 81324324 = 17917^2 + 9018^2 .

It is a cyclic number.

It is not a de Polignac number, because 402343213 - 2⁵ = 402343181 is a prime.

It is a super-2 number, since 2×402343213² = 323760122094326738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402343283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201171606 + 201171607.

It is an arithmetic number, because the mean of its divisors is an integer number (201171607).

Almost surely, 2^402343213 is an apocalyptic number.

It is an amenable number.

402343213 is a deficient number, since it is larger than the sum of its proper divisors (1).

402343213 is an equidigital number, since it uses as much as digits as its factorization.

402343213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 402343213 is about 20058.4947840061. The cubic root of 402343213 is about 738.2422445138.

Adding to 402343213 its reverse (312343204), we get a palindrome (714686417).

Subtracting from 402343213 its reverse (312343204), we obtain a palindrome (90000009).

The spelling of 402343213 in words is "four hundred two million, three hundred forty-three thousand, two hundred thirteen".