19945838 has 16 divisors (see below), whose sum is σ = 32825520. Its totient is φ = 9014400.

The previous prime is 19945831. The next prime is 19945843. The reversal of 19945838 is 83854991.

It is a junction number, because it is equal to n+sod(n) for n = 19945792 and 19945801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19945831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1478 + ... + 6486.

It is an arithmetic number, because the mean of its divisors is an integer number (2051595).

Almost surely, 2^19945838 is an apocalyptic number.

19945838 is a deficient number, since it is larger than the sum of its proper divisors (12879682).

19945838 is a wasteful number, since it uses less digits than its factorization.

19945838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5203.

The product of its digits is 311040, while the sum is 47.

The square root of 19945838 is about 4466.0763540271. The cubic root of 19945838 is about 271.1965096588.

The spelling of 19945838 in words is "nineteen million, nine hundred forty-five thousand, eight hundred thirty-eight".