402343421 has 2 divisors, whose sum is σ = 402343422. Its totient is φ = 402343420.

The previous prime is 402343391. The next prime is 402343463. The reversal of 402343421 is 124343204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393427225 + 8916196 = 19835^2 + 2986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402343421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402343481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201171710 + 201171711.

It is an arithmetic number, because the mean of its divisors is an integer number (201171711).

Almost surely, 2^402343421 is an apocalyptic number.

It is an amenable number.

402343421 is a deficient number, since it is larger than the sum of its proper divisors (1).

402343421 is an equidigital number, since it uses as much as digits as its factorization.

402343421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 402343421 is about 20058.4999688411. The cubic root of 402343421 is about 738.2423717305.

Adding to 402343421 its reverse (124343204), we get a palindrome (526686625).

The spelling of 402343421 in words is "four hundred two million, three hundred forty-three thousand, four hundred twenty-one".