209157850 has 24 divisors (see below), whose sum is σ = 424401408. Its totient is φ = 76057200.

The previous prime is 209157841. The next prime is 209157869. The reversal of 209157850 is 58751902.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189594 + ... + 190693.

It is an arithmetic number, because the mean of its divisors is an integer number (17683392).

Almost surely, 2^209157850 is an apocalyptic number.

209157850 is an abundant number, since it is smaller than the sum of its proper divisors (215243558).

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

209157850 is a wasteful number, since it uses less digits than its factorization.

209157850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380310 (or 380305 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 209157850 is about 14462.2906207834. The cubic root of 209157850 is about 593.5965793819.

The spelling of 209157850 in words is "two hundred nine million, one hundred fifty-seven thousand, eight hundred fifty".