209393139144 has 64 divisors (see below), whose sum is σ = 624277693440. Its totient is φ = 57225453120.

The previous prime is 209393139107. The next prime is 209393139187. The reversal of 209393139144 is 441931393902.

It is a junction number, because it is equal to n+sod(n) for n = 209393139093 and 209393139102.

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, 27091522 + ... + 27099249.

It is an arithmetic number, because the mean of its divisors is an integer number (9754338960).

Almost surely, 2^209393139144 is an apocalyptic number.

209393139144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

209393139144 is an abundant number, since it is smaller than the sum of its proper divisors (414884554296).

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

209393139144 is a wasteful number, since it uses less digits than its factorization.

209393139144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54190810 (or 54190806 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 48.

The spelling of 209393139144 in words is "two hundred nine billion, three hundred ninety-three million, one hundred thirty-nine thousand, one hundred forty-four".