209440672 has 24 divisors (see below), whose sum is σ = 471242016. Its totient is φ = 89760192.

The previous prime is 209440657. The next prime is 209440709. The reversal of 209440672 is 276044902.

It is a super-3 number, since 3×209440672³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467278 + ... + 467725.

It is an arithmetic number, because the mean of its divisors is an integer number (19635084).

Almost surely, 2^209440672 is an apocalyptic number.

It is an amenable number.

209440672 is an abundant number, since it is smaller than the sum of its proper divisors (261801344).

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

209440672 is an equidigital number, since it uses as much as digits as its factorization.

209440672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935020 (or 935012 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 209440672 is about 14472.0652292615. The cubic root of 209440672 is about 593.8640114654.

The spelling of 209440672 in words is "two hundred nine million, four hundred forty thousand, six hundred seventy-two".