209056538 has 16 divisors (see below), whose sum is σ = 315605376. Its totient is φ = 103857600.

The previous prime is 209056537. The next prime is 209056541. The reversal of 209056538 is 835650902.

It is not an unprimeable number, because it can be changed into a prime (209056537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371045 + ... + 371607.

It is an arithmetic number, because the mean of its divisors is an integer number (19725336).

Almost surely, 2^209056538 is an apocalyptic number.

209056538 is a deficient number, since it is larger than the sum of its proper divisors (106548838).

209056538 is a wasteful number, since it uses less digits than its factorization.

209056538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 209056538 is about 14458.7875701941. The cubic root of 209056538 is about 593.5007216852.

The spelling of 209056538 in words is "two hundred nine million, fifty-six thousand, five hundred thirty-eight".