209741390 has 8 divisors (see below), whose sum is σ = 377534520. Its totient is φ = 83896552.

The previous prime is 209741377. The next prime is 209741407. The reversal of 209741390 is 93147902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 209741390.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10487060 + ... + 10487079.

It is an arithmetic number, because the mean of its divisors is an integer number (47191815).

Almost surely, 2^209741390 is an apocalyptic number.

209741390 is a deficient number, since it is larger than the sum of its proper divisors (167793130).

209741390 is a wasteful number, since it uses less digits than its factorization.

209741390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20974146.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 209741390 is about 14482.4511046991. The cubic root of 209741390 is about 594.1481017717.

The spelling of 209741390 in words is "two hundred nine million, seven hundred forty-one thousand, three hundred ninety".