209490475 has 12 divisors (see below), whose sum is σ = 260742240. Its totient is φ = 166964000.

The previous prime is 209490451. The next prime is 209490487. The reversal of 209490475 is 574094902.

209490475 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 209490475 - 2¹¹ = 209488427 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8851 + ... + 22300.

It is an arithmetic number, because the mean of its divisors is an integer number (21728520).

Almost surely, 2^209490475 is an apocalyptic number.

209490475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

209490475 is a deficient number, since it is larger than the sum of its proper divisors (51251765).

209490475 is a wasteful number, since it uses less digits than its factorization.

209490475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31430 (or 31425 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 209490475 is about 14473.7857867249. The cubic root of 209490475 is about 593.9110794729.

The spelling of 209490475 in words is "two hundred nine million, four hundred ninety thousand, four hundred seventy-five".