204406403 has 2 divisors, whose sum is σ = 204406404. Its totient is φ = 204406402.

The previous prime is 204406393. The next prime is 204406421. The reversal of 204406403 is 304604402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204406403 - 2⁴ = 204406387 is a prime.

It is equal to p_11309333 and since 204406403 and 11309333 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (204406903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102203201 + 102203202.

It is an arithmetic number, because the mean of its divisors is an integer number (102203202).

Almost surely, 2^204406403 is an apocalyptic number.

204406403 is a deficient number, since it is larger than the sum of its proper divisors (1).

204406403 is an equidigital number, since it uses as much as digits as its factorization.

204406403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 204406403 is about 14297.0767291779. The cubic root of 204406403 is about 589.0671872686.

The spelling of 204406403 in words is "two hundred four million, four hundred six thousand, four hundred three".