209970 has 24 divisors (see below), whose sum is σ = 546156. Its totient is φ = 55968.

The previous prime is 209959. The next prime is 209971. The reversal of 209970 is 79902.

It can be written as a sum of positive squares in 2 ways, for example, as 205209 + 4761 = 453^2 + 69^2 .

It is not an unprimeable number, because it can be changed into a prime (209971) by changing a digit.

209970 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1077 + ... + 1256.

2²⁰⁹⁹⁷⁰ is an apocalyptic number.

209970 is an abundant number, since it is smaller than the sum of its proper divisors (336186).

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

209970 is a wasteful number, since it uses less digits than its factorization.

209970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2346 (or 2343 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 209970 is about 458.2248356429. The cubic root of 209970 is about 59.4363889538.

The spelling of 209970 in words is "two hundred nine thousand, nine hundred seventy".