209189492 has 6 divisors (see below), whose sum is σ = 366081618. Its totient is φ = 104594744.

The previous prime is 209189479. The next prime is 209189509. The reversal of 209189492 is 294981902.

It can be written as a sum of positive squares in only one way, i.e., 200392336 + 8797156 = 14156^2 + 2966^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26148683 + ... + 26148690.

It is an arithmetic number, because the mean of its divisors is an integer number (61013603).

Almost surely, 2^209189492 is an apocalyptic number.

It is an amenable number.

209189492 is a deficient number, since it is larger than the sum of its proper divisors (156892126).

209189492 is a wasteful number, since it uses less digits than its factorization.

209189492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52297377 (or 52297375 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 209189492 is about 14463.3845278344. The cubic root of 209189492 is about 593.6265115374.

The spelling of 209189492 in words is "two hundred nine million, one hundred eighty-nine thousand, four hundred ninety-two".