209709452 has 12 divisors (see below), whose sum is σ = 375526536. Its totient is φ = 102416160.

The previous prime is 209709449. The next prime is 209709463. The reversal of 209709452 is 254907902.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 609449 + ... + 609792.

It is an arithmetic number, because the mean of its divisors is an integer number (31293878).

Almost surely, 2^209709452 is an apocalyptic number.

It is an amenable number.

209709452 is a deficient number, since it is larger than the sum of its proper divisors (165817084).

209709452 is a wasteful number, since it uses less digits than its factorization.

209709452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219288 (or 1219286 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 209709452 is about 14481.3484178788. The cubic root of 209709452 is about 594.1179426229.

The spelling of 209709452 in words is "two hundred nine million, seven hundred nine thousand, four hundred fifty-two".