402400423 has 4 divisors (see below), whose sum is σ = 406092280. Its totient is φ = 398708568.

The previous prime is 402400399. The next prime is 402400441. The reversal of 402400423 is 324004204.

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 402400423 - 2²¹ = 400303271 is a prime.

It is a super-2 number, since 2×402400423² = 323852200861157858, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402400423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402400223) 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, 1845765 + ... + 1845982.

It is an arithmetic number, because the mean of its divisors is an integer number (101523070).

Almost surely, 2^402400423 is an apocalyptic number.

402400423 is a deficient number, since it is larger than the sum of its proper divisors (3691857).

402400423 is a wasteful number, since it uses less digits than its factorization.

402400423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3691856.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 402400423 is about 20059.9208124060. The cubic root of 402400423 is about 738.2772335777.

Adding to 402400423 its reverse (324004204), we get a palindrome (726404627).

The spelling of 402400423 in words is "four hundred two million, four hundred thousand, four hundred twenty-three".