209971232 has 24 divisors (see below), whose sum is σ = 431355456. Its totient is φ = 100420672.

The previous prime is 209971217. The next prime is 209971241. The reversal of 209971232 is 232179902.

It is a junction number, because it is equal to n+sod(n) for n = 209971192 and 209971201.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141908 + ... + 143379.

It is an arithmetic number, because the mean of its divisors is an integer number (17973144).

Almost surely, 2^209971232 is an apocalyptic number.

It is an amenable number.

209971232 is an abundant number, since it is smaller than the sum of its proper divisors (221384224).

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

209971232 is a wasteful number, since it uses less digits than its factorization.

209971232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285320 (or 285312 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 209971232 is about 14490.3841218927. The cubic root of 209971232 is about 594.3650520135.

The spelling of 209971232 in words is "two hundred nine million, nine hundred seventy-one thousand, two hundred thirty-two".