209842134 has 16 divisors (see below), whose sum is σ = 419989440. Its totient is φ = 69896520.

The previous prime is 209842123. The next prime is 209842147. The reversal of 209842134 is 431248902.

It is a junction number, because it is equal to n+sod(n) for n = 209842095 and 209842104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3232 + ... + 20739.

It is an arithmetic number, because the mean of its divisors is an integer number (26249340).

Almost surely, 2^209842134 is an apocalyptic number.

209842134 is an abundant number, since it is smaller than the sum of its proper divisors (210147306).

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

209842134 is a wasteful number, since it uses less digits than its factorization.

209842134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25435.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 209842134 is about 14485.9288276589. The cubic root of 209842134 is about 594.2432145760.

The spelling of 209842134 in words is "two hundred nine million, eight hundred forty-two thousand, one hundred thirty-four".