19988385 has 16 divisors (see below), whose sum is σ = 32114880. Its totient is φ = 10616000.

The previous prime is 19988383. The next prime is 19988411. The reversal of 19988385 is 58388991.

It is not a de Polignac number, because 19988385 - 2¹ = 19988383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19988383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1111 + ... + 6419.

It is an arithmetic number, because the mean of its divisors is an integer number (2007180).

Almost surely, 2^19988385 is an apocalyptic number.

19988385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19988385 is a deficient number, since it is larger than the sum of its proper divisors (12126495).

19988385 is a wasteful number, since it uses less digits than its factorization.

19988385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5568.

The product of its digits is 622080, while the sum is 51.

The square root of 19988385 is about 4470.8371699269. The cubic root of 19988385 is about 271.3892048830.

The spelling of 19988385 in words is "nineteen million, nine hundred eighty-eight thousand, three hundred eighty-five".