19940838 has 8 divisors (see below), whose sum is σ = 39881688. Its totient is φ = 6646944.

The previous prime is 19940821. The next prime is 19940849. The reversal of 19940838 is 83804991.

It is a sphenic number, since it is the product of 3 distinct primes.

19940838 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 19940838.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1661731 + ... + 1661742.

It is an arithmetic number, because the mean of its divisors is an integer number (4985211).

Almost surely, 2^19940838 is an apocalyptic number.

19940838 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19940838 is a wasteful number, since it uses less digits than its factorization.

19940838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3323478.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 19940838 is about 4465.5165434695. The cubic root of 19940838 is about 271.1738466874.

The spelling of 19940838 in words is "nineteen million, nine hundred forty thousand, eight hundred thirty-eight".