19988140 has 24 divisors (see below), whose sum is σ = 43111152. Its totient is φ = 7778880.

The previous prime is 19988131. The next prime is 19988153. The reversal of 19988140 is 4188991.

19988140 is nontrivially palindromic in base 9.

It is a super-3 number, since 3×19988140³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19988093 and 19988102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12766 + ... + 14245.

It is an arithmetic number, because the mean of its divisors is an integer number (1796298).

Almost surely, 2^19988140 is an apocalyptic number.

19988140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19988140 is an abundant number, since it is smaller than the sum of its proper divisors (23123012).

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

19988140 is a wasteful number, since it uses less digits than its factorization.

19988140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27057 (or 27055 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 19988140 is about 4470.8097700528. The cubic root of 19988140 is about 271.3880960620.

The spelling of 19988140 in words is "nineteen million, nine hundred eighty-eight thousand, one hundred forty".