209534842 has 32 divisors (see below), whose sum is σ = 352123200. Its totient is φ = 92707200.

The previous prime is 209534839. The next prime is 209534849. The reversal of 209534842 is 248435902.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (209534849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140742 + ... + 142222.

It is an arithmetic number, because the mean of its divisors is an integer number (11003850).

Almost surely, 2^209534842 is an apocalyptic number.

209534842 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

209534842 is a deficient number, since it is larger than the sum of its proper divisors (142588358).

209534842 is a wasteful number, since it uses less digits than its factorization.

209534842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 209534842 is about 14475.3183730100. The cubic root of 209534842 is about 593.9530037225.

The spelling of 209534842 in words is "two hundred nine million, five hundred thirty-four thousand, eight hundred forty-two".