19738940 has 72 divisors (see below), whose sum is σ = 46710720. Its totient is φ = 6963840.

The previous prime is 19738933. The next prime is 19738963. The reversal of 19738940 is 4983791.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 249821 + ... + 249899.

It is an arithmetic number, because the mean of its divisors is an integer number (648760).

Almost surely, 2^19738940 is an apocalyptic number.

19738940 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 19738940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23355360).

19738940 is an abundant number, since it is smaller than the sum of its proper divisors (26971780).

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

19738940 is a wasteful number, since it uses less digits than its factorization.

19738940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 19738940 is about 4442.8526871820. The cubic root of 19738940 is about 270.2555422443.

The spelling of 19738940 in words is "nineteen million, seven hundred thirty-eight thousand, nine hundred forty".