209475072 has 100 divisors (see below), whose sum is σ = 625351716. Its totient is φ = 69811200.

The previous prime is 209475061. The next prime is 209475121. The reversal of 209475072 is 270574902.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 38947 + ... + 43997.

Almost surely, 2^209475072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209475072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312675858).

209475072 is an abundant number, since it is smaller than the sum of its proper divisors (415876644).

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

209475072 is an frugal number, since it uses more digits than its factorization.

209475072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5081 (or 5056 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 209475072 is about 14473.2536770417. The cubic root of 209475072 is about 593.8965231443.

The spelling of 209475072 in words is "two hundred nine million, four hundred seventy-five thousand, seventy-two".