18348394428 has 288 divisors, whose sum is σ = 59488339456. Its totient is φ = 4815459072.

The previous prime is 18348394409. The next prime is 18348394433. The reversal of 18348394428 is 82449384381.

18348394428 is a `hidden beast` number, since 183 + 4 + 8 + 39 + 4 + 428 = 666.

It is a super-2 number, since 2×18348394428² (a number of 21 digits) contains 22 as substring.

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

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 95 ways as a sum of consecutive naturals, for example, 25031550 + ... + 25032282.

Almost surely, 2^18348394428 is an apocalyptic number.

18348394428 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 18348394428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29744169728).

18348394428 is an abundant number, since it is smaller than the sum of its proper divisors (41139945028).

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

18348394428 is a wasteful number, since it uses less digits than its factorization.

18348394428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055 (or 1041 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 54.

The spelling of 18348394428 in words is "eighteen billion, three hundred forty-eight million, three hundred ninety-four thousand, four hundred twenty-eight".