1804446421 has 2 divisors, whose sum is σ = 1804446422. Its totient is φ = 1804446420.

The previous prime is 1804446407. The next prime is 1804446433. The reversal of 1804446421 is 1246444081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1798947396 + 5499025 = 42414^2 + 2345^2 .

It is a cyclic number.

It is not a de Polignac number, because 1804446421 - 2⁵ = 1804446389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1804446401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 902223210 + 902223211.

It is an arithmetic number, because the mean of its divisors is an integer number (902223211).

Almost surely, 2^1804446421 is an apocalyptic number.

It is an amenable number.

1804446421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1804446421 is an equidigital number, since it uses as much as digits as its factorization.

1804446421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24576, while the sum is 34.

The square root of 1804446421 is about 42478.7761240834. The cubic root of 1804446421 is about 1217.4412062565.

The spelling of 1804446421 in words is "one billion, eight hundred four million, four hundred forty-six thousand, four hundred twenty-one".