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209979212 = 2252494803
BaseRepresentation
bin11001000010000…
…00011101001100
3112122010001022212
430201000131030
5412223313322
632500325552
75126536202
oct1441003514
9478101285
10209979212
11a8589543
125a3a38b8
133466c571
141dc5d072
151367b0e2
hexc84074c

209979212 has 6 divisors (see below), whose sum is σ = 367463628. Its totient is φ = 104989604.

The previous prime is 209979197. The next prime is 209979229. The reversal of 209979212 is 212979902.

It is a self number, because there is not a number n which added to its sum of digits gives 209979212.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26247398 + ... + 26247405.

It is an arithmetic number, because the mean of its divisors is an integer number (61243938).

Almost surely, 2209979212 is an apocalyptic number.

It is an amenable number.

209979212 is a deficient number, since it is larger than the sum of its proper divisors (157484416).

209979212 is a wasteful number, since it uses less digits than its factorization.

209979212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52494807 (or 52494805 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 209979212 is about 14490.6594742958. The cubic root of 209979212 is about 594.3725815736.

The spelling of 209979212 in words is "two hundred nine million, nine hundred seventy-nine thousand, two hundred twelve".

Divisors: 1 2 4 52494803 104989606 209979212