209964164 has 12 divisors (see below), whose sum is σ = 374370444. Its totient is φ = 103001184.

The previous prime is 209964149. The next prime is 209964191. The reversal of 209964164 is 461469902.

It can be written as a sum of positive squares in 2 ways, for example, as 144192064 + 65772100 = 12008^2 + 8110^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494987 + ... + 495410.

It is an arithmetic number, because the mean of its divisors is an integer number (31197537).

Almost surely, 2^209964164 is an apocalyptic number.

It is an amenable number.

209964164 is a deficient number, since it is larger than the sum of its proper divisors (164406280).

209964164 is a wasteful number, since it uses less digits than its factorization.

209964164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990454 (or 990452 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 209964164 is about 14490.1402339660. The cubic root of 209964164 is about 594.3583828153.

The spelling of 209964164 in words is "two hundred nine million, nine hundred sixty-four thousand, one hundred sixty-four".