204401645 has 8 divisors (see below), whose sum is σ = 280322304. Its totient is φ = 140161104.

The previous prime is 204401629. The next prime is 204401647. The reversal of 204401645 is 546104402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 204401645 - 2⁴ = 204401629 is a prime.

It is a super-3 number, since 3×204401645³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204401647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2919989 + ... + 2920058.

It is an arithmetic number, because the mean of its divisors is an integer number (35040288).

Almost surely, 2^204401645 is an apocalyptic number.

It is an amenable number.

204401645 is a deficient number, since it is larger than the sum of its proper divisors (75920659).

204401645 is an equidigital number, since it uses as much as digits as its factorization.

204401645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5840059.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 204401645 is about 14296.9103305574. The cubic root of 204401645 is about 589.0626166299.

The spelling of 204401645 in words is "two hundred four million, four hundred one thousand, six hundred forty-five".