18403947828 has 54 divisors (see below), whose sum is σ = 54116375586. Its totient is φ = 5258270304.

The previous prime is 18403947817. The next prime is 18403947853. The reversal of 18403947828 is 82874930481.

It is a happy number.

18403947828 is a `hidden beast` number, since 184 + 0 + 394 + 78 + 2 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17771022864 + 632924964 = 133308^2 + 25158^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5214775 + ... + 5218302.

Almost surely, 2^18403947828 is an apocalyptic number.

18403947828 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18403947828 is an abundant number, since it is smaller than the sum of its proper divisors (35712427758).

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

18403947828 is a wasteful number, since it uses less digits than its factorization.

18403947828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10433101 (or 10433089 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The spelling of 18403947828 in words is "eighteen billion, four hundred three million, nine hundred forty-seven thousand, eight hundred twenty-eight".