209339972 has 24 divisors (see below), whose sum is σ = 389050200. Its totient is φ = 98219520.

The previous prime is 209339971. The next prime is 209340037. The reversal of 209339972 is 279933902.

It can be written as a sum of positive squares in 4 ways, for example, as 93045316 + 116294656 = 9646^2 + 10784^2 .

It is not an unprimeable number, because it can be changed into a prime (209339971) 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, 19322 + ... + 28142.

It is an arithmetic number, because the mean of its divisors is an integer number (16210425).

Almost surely, 2^209339972 is an apocalyptic number.

It is an amenable number.

209339972 is a deficient number, since it is larger than the sum of its proper divisors (179710228).

209339972 is a wasteful number, since it uses less digits than its factorization.

209339972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9191 (or 9189 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 44.

The square root of 209339972 is about 14468.5856945314. The cubic root of 209339972 is about 593.7688187276.

The spelling of 209339972 in words is "two hundred nine million, three hundred thirty-nine thousand, nine hundred seventy-two".