19838121 has 16 divisors (see below), whose sum is σ = 27869184. Its totient is φ = 12527504.

The previous prime is 19838113. The next prime is 19838123. The reversal of 19838121 is 12183891.

It is a cyclic number.

It is not a de Polignac number, because 19838121 - 2³ = 19838113 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19838123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6040 + ... + 8726.

It is an arithmetic number, because the mean of its divisors is an integer number (1741824).

Almost surely, 2^19838121 is an apocalyptic number.

It is an amenable number.

19838121 is a deficient number, since it is larger than the sum of its proper divisors (8031063).

19838121 is a wasteful number, since it uses less digits than its factorization.

19838121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2820.

The product of its digits is 3456, while the sum is 33.

The square root of 19838121 is about 4454.0005612932. Note that the first 3 decimals coincide. The cubic root of 19838121 is about 270.7074315221.

The spelling of 19838121 in words is "nineteen million, eight hundred thirty-eight thousand, one hundred twenty-one".