19840637040 has 120 divisors (see below), whose sum is σ = 71547809040. Its totient is φ = 4535000064.

The previous prime is 19840637029. The next prime is 19840637099. The reversal of 19840637040 is 4073604891.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 19840636983 and 19840637001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 831805 + ... + 855324.

It is an arithmetic number, because the mean of its divisors is an integer number (596231742).

Almost surely, 2^19840637040 is an apocalyptic number.

19840637040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19840637040 is an abundant number, since it is smaller than the sum of its proper divisors (51707172000).

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

19840637040 is a wasteful number, since it uses less digits than its factorization.

19840637040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687159 (or 1687146 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 19840637040 in words is "nineteen billion, eight hundred forty million, six hundred thirty-seven thousand, forty".