209693340 has 96 divisors (see below), whose sum is σ = 654480960. Its totient is φ = 55738368.

The previous prime is 209693333. The next prime is 209693359. The reversal of 209693340 is 43396902.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 209693295 and 209693304.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 311244 + ... + 311916.

It is an arithmetic number, because the mean of its divisors is an integer number (6817510).

Almost surely, 2^209693340 is an apocalyptic number.

209693340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209693340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327240480).

209693340 is an abundant number, since it is smaller than the sum of its proper divisors (444787620).

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

209693340 is a wasteful number, since it uses less digits than its factorization.

209693340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268 (or 1260 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 36.

The square root of 209693340 is about 14480.7921054064. The cubic root of 209693340 is about 594.1027268512.

The spelling of 209693340 in words is "two hundred nine million, six hundred ninety-three thousand, three hundred forty".