18871900240 has 80 divisors (see below), whose sum is σ = 44258859216. Its totient is φ = 7483392000.

The previous prime is 18871900237. The next prime is 18871900241. The reversal of 18871900240 is 4200917881.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2470487616 + 16401412624 = 49704^2 + 128068^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×18871900240² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 18871900193 and 18871900202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18871900241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4490140 + ... + 4494340.

Almost surely, 2^18871900240 is an apocalyptic number.

18871900240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18871900240 is an abundant number, since it is smaller than the sum of its proper divisors (25386958976).

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

18871900240 is a wasteful number, since it uses less digits than its factorization.

18871900240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4688 (or 4682 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 40.

The spelling of 18871900240 in words is "eighteen billion, eight hundred seventy-one million, nine hundred thousand, two hundred forty".