209234190 has 128 divisors (see below), whose sum is σ = 573640704. Its totient is φ = 48384000.

The previous prime is 209234171. The next prime is 209234191. The reversal of 209234190 is 91432902.

It is a super-2 number, since 2×209234190² = 87557892529912200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209234191) 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 63 ways as a sum of consecutive naturals, for example, 1155900 + ... + 1156080.

It is an arithmetic number, because the mean of its divisors is an integer number (4481568).

Almost surely, 2^209234190 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209234190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286820352).

209234190 is an abundant number, since it is smaller than the sum of its proper divisors (364406514).

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

209234190 is a wasteful number, since it uses less digits than its factorization.

209234190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 209234190 is about 14464.9296576236. The cubic root of 209234190 is about 593.6687890405.

The spelling of 209234190 in words is "two hundred nine million, two hundred thirty-four thousand, one hundred ninety".