209342808 has 48 divisors (see below), whose sum is σ = 568854000. Its totient is φ = 69549120.

The previous prime is 209342807. The next prime is 209342813. The reversal of 209342808 is 808243902.

It is a super-2 number, since 2×209342808² = 87648822522649728, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209342807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17718 + ... + 27066.

It is an arithmetic number, because the mean of its divisors is an integer number (11851125).

Almost surely, 2^209342808 is an apocalyptic number.

It is an amenable number.

209342808 is an abundant number, since it is smaller than the sum of its proper divisors (359511192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209342808 is a wasteful number, since it uses less digits than its factorization.

209342808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9672 (or 9665 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 209342808 is about 14468.6836996321. The cubic root of 209342808 is about 593.7715000451.

The spelling of 209342808 in words is "two hundred nine million, three hundred forty-two thousand, eight hundred eight".