19999140 has 96 divisors (see below), whose sum is σ = 67785984. Its totient is φ = 4300800.

The previous prime is 19999127. The next prime is 19999159. The reversal of 19999140 is 4199991.

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 = 19999092 and 19999101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5740 + ... + 8540.

It is an arithmetic number, because the mean of its divisors is an integer number (706104).

Almost surely, 2^19999140 is an apocalyptic number.

19999140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19999140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33892992).

19999140 is an abundant number, since it is smaller than the sum of its proper divisors (47786844).

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

19999140 is a wasteful number, since it uses less digits than its factorization.

19999140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2837 (or 2835 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 42.

The square root of 19999140 is about 4472.0398030429. The cubic root of 19999140 is about 271.4378709385.

The spelling of 19999140 in words is "nineteen million, nine hundred ninety-nine thousand, one hundred forty".