209148912 has 80 divisors (see below), whose sum is σ = 686106880. Its totient is φ = 59755968.

The previous prime is 209148911. The next prime is 209148917. The reversal of 209148912 is 219841902.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209148911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31558 + ... + 37605.

It is an arithmetic number, because the mean of its divisors is an integer number (8576336).

Almost surely, 2^209148912 is an apocalyptic number.

It is an amenable number.

209148912 is an abundant number, since it is smaller than the sum of its proper divisors (476957968).

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

209148912 is a wasteful number, since it uses less digits than its factorization.

209148912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69187 (or 69175 counting only the distinct ones).

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

The square root of 209148912 is about 14461.9816069583. The cubic root of 209148912 is about 593.5881238194.

The spelling of 209148912 in words is "two hundred nine million, one hundred forty-eight thousand, nine hundred twelve".