402404423 has 4 divisors (see below), whose sum is σ = 406165320. Its totient is φ = 398643528.

The previous prime is 402404411. The next prime is 402404437. The reversal of 402404423 is 324404204.

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

It is a cyclic number.

It is not a de Polignac number, because 402404423 - 2⁴ = 402404407 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 (402404473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1880288 + ... + 1880501.

It is an arithmetic number, because the mean of its divisors is an integer number (101541330).

Almost surely, 2^402404423 is an apocalyptic number.

402404423 is a deficient number, since it is larger than the sum of its proper divisors (3760897).

402404423 is a wasteful number, since it uses less digits than its factorization.

402404423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3760896.

The product of its (nonzero) digits is 3072, while the sum is 23.

The square root of 402404423 is about 20060.0205134491. The cubic root of 402404423 is about 738.2796798136.

Adding to 402404423 its reverse (324404204), we get a palindrome (726808627).

The spelling of 402404423 in words is "four hundred two million, four hundred four thousand, four hundred twenty-three".