19388140 has 12 divisors (see below), whose sum is σ = 40715136. Its totient is φ = 7755248.

The previous prime is 19388123. The next prime is 19388147. The reversal of 19388140 is 4188391.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19388096 and 19388105.

It is not an unprimeable number, because it can be changed into a prime (19388147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 484684 + ... + 484723.

It is an arithmetic number, because the mean of its divisors is an integer number (3392928).

Almost surely, 2^19388140 is an apocalyptic number.

19388140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19388140 is an abundant number, since it is smaller than the sum of its proper divisors (21326996).

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

19388140 is a wasteful number, since it uses less digits than its factorization.

19388140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969416 (or 969414 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 19388140 is about 4403.1965661324. The cubic root of 19388140 is about 268.6449713989.

The spelling of 19388140 in words is "nineteen million, three hundred eighty-eight thousand, one hundred forty".