209350974540890 has 32 divisors (see below), whose sum is σ = 463792928215680. Its totient is φ = 66256132601664.

The previous prime is 209350974540881. The next prime is 209350974540899. The reversal of 209350974540890 is 98045479053902.

It is an interprime number because it is at equal distance from previous prime (209350974540881) and next prime (209350974540899).

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is not an unprimeable number, because it can be changed into a prime (209350974540899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115028007080 + ... + 115028008899.

It is an arithmetic number, because the mean of its divisors is an integer number (14493529006740).

Almost surely, 2^{209350974540890} is an apocalyptic number.

209350974540890 is an abundant number, since it is smaller than the sum of its proper divisors (254441953674790).

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

209350974540890 is a wasteful number, since it uses less digits than its factorization.

209350974540890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230056016006.

The product of its (nonzero) digits is 97977600, while the sum is 65.

The spelling of 209350974540890 in words is "two hundred nine trillion, three hundred fifty billion, nine hundred seventy-four million, five hundred forty thousand, eight hundred ninety".