3873437721918 has 24 divisors (see below), whose sum is σ = 8400986023248. Its totient is φ = 1289832426432.

The previous prime is 3873437721911. The next prime is 3873437721931. The reversal of 3873437721918 is 8191277343783.

3873437721918 is a `hidden beast` number, since 3 + 8 + 7 + 3 + 437 + 7 + 2 + 191 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3873437721911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109438555 + ... + 109473942.

It is an arithmetic number, because the mean of its divisors is an integer number (350041084302).

Almost surely, 2^{3873437721918} is an apocalyptic number.

3873437721918 is an abundant number, since it is smaller than the sum of its proper divisors (4527548301330).

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

3873437721918 is a wasteful number, since it uses less digits than its factorization.

3873437721918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218913488 (or 218913485 counting only the distinct ones).

The product of its digits is 42674688, while the sum is 63.

The spelling of 3873437721918 in words is "three trillion, eight hundred seventy-three billion, four hundred thirty-seven million, seven hundred twenty-one thousand, nine hundred eighteen".