209690340 has 24 divisors (see below), whose sum is σ = 587133120. Its totient is φ = 55917408.

The previous prime is 209690339. The next prime is 209690389. The reversal of 209690340 is 43096902.

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, 1747360 + ... + 1747479.

It is an arithmetic number, because the mean of its divisors is an integer number (24463880).

Almost surely, 2^209690340 is an apocalyptic number.

209690340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209690340 is an abundant number, since it is smaller than the sum of its proper divisors (377442780).

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

209690340 is a wasteful number, since it uses less digits than its factorization.

209690340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3494851 (or 3494849 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 209690340 is about 14480.6885195422. The cubic root of 209690340 is about 594.0998936398.

The spelling of 209690340 in words is "two hundred nine million, six hundred ninety thousand, three hundred forty".