1804219258 has 4 divisors (see below), whose sum is σ = 2706328890. Its totient is φ = 902109628.

The previous prime is 1804219243. The next prime is 1804219259. The reversal of 1804219258 is 8529124081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8529124081 = 431 ⋅19789151.

It can be written as a sum of positive squares in only one way, i.e., 1438912489 + 365306769 = 37933^2 + 19113^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1804219258.

It is not an unprimeable number, because it can be changed into a prime (1804219259) 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 as a sum of consecutive naturals, namely, 451054813 + ... + 451054816.

Almost surely, 2^1804219258 is an apocalyptic number.

1804219258 is a deficient number, since it is larger than the sum of its proper divisors (902109632).

1804219258 is an equidigital number, since it uses as much as digits as its factorization.

1804219258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902109631.

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 1804219258 is about 42476.1021987658. The cubic root of 1804219258 is about 1217.3901159425.

The spelling of 1804219258 in words is "one billion, eight hundred four million, two hundred nineteen thousand, two hundred fifty-eight".