19888134 has 16 divisors (see below), whose sum is σ = 45458688. Its totient is φ = 5682312.

The previous prime is 19888111. The next prime is 19888177. The reversal of 19888134 is 43188891.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 473527 = 19888134 / (1 + 9 + 8 + 8 + 8 + 1 + 3 + 4).

It is a congruent number.

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, 236722 + ... + 236805.

It is an arithmetic number, because the mean of its divisors is an integer number (2841168).

Almost surely, 2^19888134 is an apocalyptic number.

19888134 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

19888134 is an abundant number, since it is smaller than the sum of its proper divisors (25570554).

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

19888134 is a wasteful number, since it uses less digits than its factorization.

19888134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473539.

The product of its digits is 55296, while the sum is 42.

The square root of 19888134 is about 4459.6114180498. The cubic root of 19888134 is about 270.9347300861.

The spelling of 19888134 in words is "nineteen million, eight hundred eighty-eight thousand, one hundred thirty-four".