18471499420 has 144 divisors (see below), whose sum is σ = 46332518400. Its totient is φ = 6157641600.

The previous prime is 18471499391. The next prime is 18471499463. The reversal of 18471499420 is 2499417481.

It is a happy number.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 1418901 + ... + 1431859.

It is an arithmetic number, because the mean of its divisors is an integer number (321753600).

Almost surely, 2^18471499420 is an apocalyptic number.

18471499420 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 18471499420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23166259200).

18471499420 is an abundant number, since it is smaller than the sum of its proper divisors (27861018980).

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

18471499420 is a wasteful number, since it uses less digits than its factorization.

18471499420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13040 (or 13027 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 49.

The spelling of 18471499420 in words is "eighteen billion, four hundred seventy-one million, four hundred ninety-nine thousand, four hundred twenty".