209149652 has 12 divisors (see below), whose sum is σ = 367374420. Its totient is φ = 104185536.

The previous prime is 209149621. The next prime is 209149667. The reversal of 209149652 is 256941902.

It can be written as a sum of positive squares in 2 ways, for example, as 5973136 + 203176516 = 2444^2 + 14254^2 .

It is a super-2 number, since 2×209149652² = 87487153863442208, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96113 + ... + 98264.

It is an arithmetic number, because the mean of its divisors is an integer number (30614535).

Almost surely, 2^209149652 is an apocalyptic number.

It is an amenable number.

209149652 is a deficient number, since it is larger than the sum of its proper divisors (158224768).

209149652 is a wasteful number, since it uses less digits than its factorization.

209149652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194650 (or 194648 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 209149652 is about 14462.0071912581. The cubic root of 209149652 is about 593.5888238863.

The spelling of 209149652 in words is "two hundred nine million, one hundred forty-nine thousand, six hundred fifty-two".