402143321 has 4 divisors (see below), whose sum is σ = 403869492. Its totient is φ = 400417152.

The previous prime is 402143311. The next prime is 402143323. The reversal of 402143321 is 123341204.

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

It can be written as a sum of positive squares in 2 ways, for example, as 50055625 + 352087696 = 7075^2 + 18764^2 .

It is a cyclic number.

It is not a de Polignac number, because 402143321 - 2²² = 397949017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402143293 and 402143302.

It is not an unprimeable number, because it can be changed into a prime (402143323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 862736 + ... + 863201.

It is an arithmetic number, because the mean of its divisors is an integer number (100967373).

Almost surely, 2^402143321 is an apocalyptic number.

It is an amenable number.

402143321 is a deficient number, since it is larger than the sum of its proper divisors (1726171).

402143321 is a wasteful number, since it uses less digits than its factorization.

402143321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1726170.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 402143321 is about 20053.5114381497. The cubic root of 402143321 is about 738.1199665191.

Adding to 402143321 its reverse (123341204), we get a palindrome (525484525).

The spelling of 402143321 in words is "four hundred two million, one hundred forty-three thousand, three hundred twenty-one".