18400374540 has 72 divisors (see below), whose sum is σ = 57322989360. Its totient is φ = 4774149504.

The previous prime is 18400374533. The next prime is 18400374547. The reversal of 18400374540 is 4547300481.

18400374540 is a `hidden beast` number, since 1 + 8 + 40 + 0 + 3 + 74 + 540 = 666.

It is an interprime number because it is at equal distance from previous prime (18400374533) and next prime (18400374547).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18400374495 and 18400374504.

It is not an unprimeable number, because it can be changed into a prime (18400374547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1374750 + ... + 1388069.

It is an arithmetic number, because the mean of its divisors is an integer number (796152630).

Almost surely, 2^18400374540 is an apocalyptic number.

18400374540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18400374540 is an abundant number, since it is smaller than the sum of its proper divisors (38922614820).

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

18400374540 is a wasteful number, since it uses less digits than its factorization.

18400374540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2762871 (or 2762866 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The spelling of 18400374540 in words is "eighteen billion, four hundred million, three hundred seventy-four thousand, five hundred forty".