19908738 has 48 divisors (see below), whose sum is σ = 44815680. Its totient is φ = 6382368.

The previous prime is 19908719. The next prime is 19908743. The reversal of 19908738 is 83780991.

It is a junction number, because it is equal to n+sod(n) for n = 19908693 and 19908702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111133 + ... + 111311.

It is an arithmetic number, because the mean of its divisors is an integer number (933660).

Almost surely, 2^19908738 is an apocalyptic number.

19908738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19908738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22407840).

19908738 is an abundant number, since it is smaller than the sum of its proper divisors (24906942).

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

19908738 is a wasteful number, since it uses less digits than its factorization.

19908738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391 (or 388 counting only the distinct ones).

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

The square root of 19908738 is about 4461.9208867930. The cubic root of 19908738 is about 271.0282601031.

The spelling of 19908738 in words is "nineteen million, nine hundred eight thousand, seven hundred thirty-eight".