209690452 has 6 divisors (see below), whose sum is σ = 366958298. Its totient is φ = 104845224.

The previous prime is 209690449. The next prime is 209690473. The reversal of 209690452 is 254096902.

It can be written as a sum of positive squares in only one way, i.e., 192765456 + 16924996 = 13884^2 + 4114^2 .

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, 26211303 + ... + 26211310.

Almost surely, 2^209690452 is an apocalyptic number.

It is an amenable number.

209690452 is a deficient number, since it is larger than the sum of its proper divisors (157267846).

209690452 is a wasteful number, since it uses less digits than its factorization.

209690452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52422617 (or 52422615 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 209690452 is about 14480.6923867611. The cubic root of 209690452 is about 594.0999994135.

The spelling of 209690452 in words is "two hundred nine million, six hundred ninety thousand, four hundred fifty-two".