213803905 has 32 divisors (see below), whose sum is σ = 304416000. Its totient is φ = 144055296.

The previous prime is 213803881. The next prime is 213803911. The reversal of 213803905 is 509308312.

It is a happy number.

213803905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213803905 - 2⁹ = 213803393 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100129 + ... + 102241.

It is an arithmetic number, because the mean of its divisors is an integer number (9513000).

Almost surely, 2^213803905 is an apocalyptic number.

It is an amenable number.

213803905 is a deficient number, since it is larger than the sum of its proper divisors (90612095).

213803905 is an equidigital number, since it uses as much as digits as its factorization.

213803905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2198 (or 2184 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 213803905 is about 14622.0349131029. The cubic root of 213803905 is about 597.9596481760.

The spelling of 213803905 in words is "two hundred thirteen million, eight hundred three thousand, nine hundred five".