18707021424 has 240 divisors, whose sum is σ = 66515298304. Its totient is φ = 4774464000.

The previous prime is 18707021419. The next prime is 18707021447. The reversal of 18707021424 is 42412070781.

It is a hoax number, since the sum of its digits (36) 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 (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 383199 + ... + 429249.

Almost surely, 2^18707021424 is an apocalyptic number.

18707021424 is a gapful number since it is divisible by the number (14) 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 18707021424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33257649152).

18707021424 is an abundant number, since it is smaller than the sum of its proper divisors (47808276880).

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

18707021424 is a wasteful number, since it uses less digits than its factorization.

18707021424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46116 (or 46107 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The spelling of 18707021424 in words is "eighteen billion, seven hundred seven million, twenty-one thousand, four hundred twenty-four".