402430321 has 4 divisors (see below), whose sum is σ = 406952100. Its totient is φ = 397908544.

The previous prime is 402430319. The next prime is 402430331. The reversal of 402430321 is 123034204.

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 253956096 + 148474225 = 15936^2 + 12185^2 .

It is a cyclic number.

It is not a de Polignac number, because 402430321 - 2¹ = 402430319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402430331) 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, 2260756 + ... + 2260933.

It is an arithmetic number, because the mean of its divisors is an integer number (101738025).

Almost surely, 2^402430321 is an apocalyptic number.

It is an amenable number.

402430321 is a deficient number, since it is larger than the sum of its proper divisors (4521779).

402430321 is an equidigital number, since it uses as much as digits as its factorization.

402430321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4521778.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 402430321 is about 20060.6660158630. Note that the first 3 decimals coincide. The cubic root of 402430321 is about 738.2955175761.

Adding to 402430321 its reverse (123034204), we get a palindrome (525464525).

The spelling of 402430321 in words is "four hundred two million, four hundred thirty thousand, three hundred twenty-one".