209291148 has 192 divisors, whose sum is σ = 643991040. Its totient is φ = 58060800.

The previous prime is 209291143. The next prime is 209291149. The reversal of 209291148 is 841192902.

209291148 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (209291143) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 868308 + ... + 868548.

It is an arithmetic number, because the mean of its divisors is an integer number (3354120).

Almost surely, 2^209291148 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 209291148, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321995520).

209291148 is an abundant number, since it is smaller than the sum of its proper divisors (434699892).

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

209291148 is a wasteful number, since it uses less digits than its factorization.

209291148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 209291148 is about 14466.8983545195. The cubic root of 209291148 is about 593.7226539132.

The spelling of 209291148 in words is "two hundred nine million, two hundred ninety-one thousand, one hundred forty-eight".