209030904 has 24 divisors (see below), whose sum is σ = 566125560. Its totient is φ = 69676944.

The previous prime is 209030897. The next prime is 209030909. The reversal of 209030904 is 409030902.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209030909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1451532 + ... + 1451675.

It is an arithmetic number, because the mean of its divisors is an integer number (23588565).

Almost surely, 2^209030904 is an apocalyptic number.

209030904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

209030904 is an abundant number, since it is smaller than the sum of its proper divisors (357094656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209030904 is a wasteful number, since it uses less digits than its factorization.

209030904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903219 (or 2903212 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 209030904 is about 14457.9010924823. The cubic root of 209030904 is about 593.4764628260.

The spelling of 209030904 in words is "two hundred nine million, thirty thousand, nine hundred four".