18195807240 has 96 divisors (see below), whose sum is σ = 63685341720. Its totient is φ = 4478966784.

The previous prime is 18195807239. The next prime is 18195807247. The reversal of 18195807240 is 4270859181.

18195807240 is a `hidden beast` number, since 18 + 19 + 580 + 7 + 2 + 40 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5678225316 + 12517581924 = 75354^2 + 111882^2 .

It is a super-2 number, since 2×18195807240² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (18195807247) 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, 1939317 + ... + 1948676.

Almost surely, 2^18195807240 is an apocalyptic number.

18195807240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18195807240 is an abundant number, since it is smaller than the sum of its proper divisors (45489534480).

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

18195807240 is a wasteful number, since it uses less digits than its factorization.

18195807240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888023 (or 3888016 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 18195807240 in words is "eighteen billion, one hundred ninety-five million, eight hundred seven thousand, two hundred forty".