402340423 has 4 divisors (see below), whose sum is σ = 402935400. Its totient is φ = 401745448.

The previous prime is 402340397. The next prime is 402340441. The reversal of 402340423 is 324043204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402340423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402340394 and 402340403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402340453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 296473 + ... + 297826.

It is an arithmetic number, because the mean of its divisors is an integer number (100733850).

Almost surely, 2^402340423 is an apocalyptic number.

402340423 is a deficient number, since it is larger than the sum of its proper divisors (594977).

402340423 is an equidigital number, since it uses as much as digits as its factorization.

402340423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594976.

The product of its (nonzero) digits is 2304, while the sum is 22.

The square root of 402340423 is about 20058.4252372912. The cubic root of 402340423 is about 738.2405380929.

Adding to 402340423 its reverse (324043204), we get a palindrome (726383627).

The spelling of 402340423 in words is "four hundred two million, three hundred forty thousand, four hundred twenty-three".