19420838 has 8 divisors (see below), whose sum is σ = 29482488. Its totient is φ = 9593344.

The previous prime is 19420837. The next prime is 19420867. The reversal of 19420838 is 83802491.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 19420798 and 19420807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19420837) by changing a digit.

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, 58331 + ... + 58662.

It is an arithmetic number, because the mean of its divisors is an integer number (3685311).

Almost surely, 2^19420838 is an apocalyptic number.

19420838 is a deficient number, since it is larger than the sum of its proper divisors (10061650).

19420838 is a wasteful number, since it uses less digits than its factorization.

19420838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117078.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 19420838 is about 4406.9079863324. The cubic root of 19420838 is about 268.7959093736.

The spelling of 19420838 in words is "nineteen million, four hundred twenty thousand, eight hundred thirty-eight".