209970912 has 24 divisors (see below), whose sum is σ = 551173896. Its totient is φ = 69990272.

The previous prime is 209970899. The next prime is 209970913. The reversal of 209970912 is 219079902.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×209970912² = 88175567772223488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209970913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1093503 + ... + 1093694.

It is an arithmetic number, because the mean of its divisors is an integer number (22965579).

Almost surely, 2^209970912 is an apocalyptic number.

It is an amenable number.

209970912 is an abundant number, since it is smaller than the sum of its proper divisors (341202984).

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

209970912 is a wasteful number, since it uses less digits than its factorization.

209970912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187210 (or 2187202 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 209970912 is about 14490.3730800832. The cubic root of 209970912 is about 594.3647500723.

The spelling of 209970912 in words is "two hundred nine million, nine hundred seventy thousand, nine hundred twelve".