209106312 has 32 divisors (see below), whose sum is σ = 525062400. Its totient is φ = 69395904.

The previous prime is 209106281. The next prime is 209106319. The reversal of 209106312 is 213601902.

209106312 is digitally balanced in base 2 and base 3, because in such bases 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 (24).

It is not an unprimeable number, because it can be changed into a prime (209106319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13528 + ... + 24519.

It is an arithmetic number, because the mean of its divisors is an integer number (16408200).

Almost surely, 2^209106312 is an apocalyptic number.

It is an amenable number.

209106312 is an abundant number, since it is smaller than the sum of its proper divisors (315956088).

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

209106312 is a wasteful number, since it uses less digits than its factorization.

209106312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38285 (or 38281 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 209106312 is about 14460.5087047448. The cubic root of 209106312 is about 593.5478198866.

The spelling of 209106312 in words is "two hundred nine million, one hundred six thousand, three hundred twelve".