209149472 has 24 divisors (see below), whose sum is σ = 470586816. Its totient is φ = 89635392.

The previous prime is 209149471. The next prime is 209149481. The reversal of 209149472 is 274941902.

209149472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (209149471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466628 + ... + 467075.

It is an arithmetic number, because the mean of its divisors is an integer number (19607784).

Almost surely, 2^209149472 is an apocalyptic number.

It is an amenable number.

209149472 is an abundant number, since it is smaller than the sum of its proper divisors (261437344).

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

209149472 is an equidigital number, since it uses as much as digits as its factorization.

209149472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933720 (or 933712 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 209149472 is about 14462.0009680542. Note that the first 3 decimals coincide. The cubic root of 209149472 is about 593.5886535999.

The spelling of 209149472 in words is "two hundred nine million, one hundred forty-nine thousand, four hundred seventy-two".