19987038 has 24 divisors (see below), whose sum is σ = 43954248. Its totient is φ = 6562512.

The previous prime is 19987027. The next prime is 19987039. The reversal of 19987038 is 83078991.

It is a junction number, because it is equal to n+sod(n) for n = 19986984 and 19987002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19987039) 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, 7081 + ... + 9492.

It is an arithmetic number, because the mean of its divisors is an integer number (1831427).

Almost surely, 2^19987038 is an apocalyptic number.

19987038 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19987038 is an abundant number, since it is smaller than the sum of its proper divisors (23967210).

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

19987038 is a wasteful number, since it uses less digits than its factorization.

19987038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16648 (or 16645 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 19987038 is about 4470.6865244613. The cubic root of 19987038 is about 271.3831085181.

The spelling of 19987038 in words is "nineteen million, nine hundred eighty-seven thousand, thirty-eight".