18939752208 has 160 divisors (see below), whose sum is σ = 58658745600. Its totient is φ = 5816392704.

The previous prime is 18939752203. The next prime is 18939752231. The reversal of 18939752208 is 80225793981.

18939752208 is a `hidden beast` number, since 1 + 89 + 39 + 7 + 522 + 0 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (18939752203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3192541 + ... + 3198467.

It is an arithmetic number, because the mean of its divisors is an integer number (366617160).

Almost surely, 2^18939752208 is an apocalyptic number.

18939752208 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18939752208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29329372800).

18939752208 is an abundant number, since it is smaller than the sum of its proper divisors (39718993392).

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

18939752208 is a wasteful number, since it uses less digits than its factorization.

18939752208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6526 (or 6514 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 18939752208 in words is "eighteen billion, nine hundred thirty-nine million, seven hundred fifty-two thousand, two hundred eight".