209140386 has 32 divisors (see below), whose sum is σ = 514808448. Its totient is φ = 55157760.

The previous prime is 209140363. The next prime is 209140417. The reversal of 209140386 is 683041902.

209140386 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 190975 + ... + 192066.

It is an arithmetic number, because the mean of its divisors is an integer number (16087764).

Almost surely, 2^209140386 is an apocalyptic number.

209140386 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

209140386 is an abundant number, since it is smaller than the sum of its proper divisors (305668062).

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

209140386 is a wasteful number, since it uses less digits than its factorization.

209140386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383066.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 209140386 is about 14461.6868310720. The cubic root of 209140386 is about 593.5800577943.

The spelling of 209140386 in words is "two hundred nine million, one hundred forty thousand, three hundred eighty-six".