204405019 has 16 divisors (see below), whose sum is σ = 256715200. Its totient is φ = 161723520.

The previous prime is 204405001. The next prime is 204405023. The reversal of 204405019 is 910504402.

It is not a de Polignac number, because 204405019 - 2⁵ = 204404987 is a prime.

It is a super-2 number, since 2×204405019² = 83562823584780722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 204404984 and 204405002.

It is not an unprimeable number, because it can be changed into a prime (204405419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18462 + ... + 27379.

It is an arithmetic number, because the mean of its divisors is an integer number (16044700).

Almost surely, 2^204405019 is an apocalyptic number.

204405019 is a deficient number, since it is larger than the sum of its proper divisors (52310181).

204405019 is an equidigital number, since it uses as much as digits as its factorization.

204405019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45875 (or 45861 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 204405019 is about 14297.0283275931. The cubic root of 204405019 is about 589.0658577753.

The spelling of 204405019 in words is "two hundred four million, four hundred five thousand, nineteen".