19879938 has 32 divisors (see below), whose sum is σ = 47577600. Its totient is φ = 6116688.

The previous prime is 19879921. The next prime is 19879939. The reversal of 19879938 is 83997891.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (19879939) 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, 13458 + ... + 14861.

It is an arithmetic number, because the mean of its divisors is an integer number (1486800).

Almost surely, 2^19879938 is an apocalyptic number.

19879938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19879938 is an abundant number, since it is smaller than the sum of its proper divisors (27697662).

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

19879938 is a wasteful number, since it uses less digits than its factorization.

19879938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28343 (or 28337 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 19879938 is about 4458.6924092160. The cubic root of 19879938 is about 270.8975071176.

The spelling of 19879938 in words is "nineteen million, eight hundred seventy-nine thousand, nine hundred thirty-eight".