209240904 has 32 divisors (see below), whose sum is σ = 531972000. Its totient is φ = 68564352.

The previous prime is 209240903. The next prime is 209240909. The reversal of 209240904 is 409042902.

It is not an unprimeable number, because it can be changed into a prime (209240903) 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, 72469 + ... + 75300.

It is an arithmetic number, because the mean of its divisors is an integer number (16624125).

Almost surely, 2^209240904 is an apocalyptic number.

209240904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

209240904 is an abundant number, since it is smaller than the sum of its proper divisors (322731096).

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

209240904 is a wasteful number, since it uses less digits than its factorization.

209240904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147837 (or 147833 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 209240904 is about 14465.1617343188. The cubic root of 209240904 is about 593.6751389422.

The spelling of 209240904 in words is "two hundred nine million, two hundred forty thousand, nine hundred four".