18011407440 has 160 divisors (see below), whose sum is σ = 60323389056. Its totient is φ = 4419348480.

The previous prime is 18011407411. The next prime is 18011407451. The reversal of 18011407440 is 4470411081.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 18011407398 and 18011407407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 979935 + ... + 998145.

Almost surely, 2^18011407440 is an apocalyptic number.

18011407440 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 18011407440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30161694528).

18011407440 is an abundant number, since it is smaller than the sum of its proper divisors (42311981616).

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

18011407440 is a wasteful number, since it uses less digits than its factorization.

18011407440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18557 (or 18551 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The spelling of 18011407440 in words is "eighteen billion, eleven million, four hundred seven thousand, four hundred forty".