18439394160 has 320 divisors, whose sum is σ = 64361594880. Its totient is φ = 4328432640.

The previous prime is 18439394153. The next prime is 18439394173. The reversal of 18439394160 is 6149393481.

It is a super-2 number, since 2×18439394160² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14416401 + ... + 14417679.

It is an arithmetic number, because the mean of its divisors is an integer number (201129984).

Almost surely, 2^18439394160 is an apocalyptic number.

18439394160 is a gapful number since it is divisible by the number (10) 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 18439394160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32180797440).

18439394160 is an abundant number, since it is smaller than the sum of its proper divisors (45922200720).

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

18439394160 is a wasteful number, since it uses less digits than its factorization.

18439394160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476 (or 1470 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 48.

The spelling of 18439394160 in words is "eighteen billion, four hundred thirty-nine million, three hundred ninety-four thousand, one hundred sixty".