19838123 has 2 divisors, whose sum is σ = 19838124. Its totient is φ = 19838122.

The previous prime is 19838113. The next prime is 19838129. The reversal of 19838123 is 32183891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19838123 - 2¹⁶ = 19772587 is a prime.

It is a super-2 number, since 2×19838123² = 787102248326258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19838129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9919061 + 9919062.

It is an arithmetic number, because the mean of its divisors is an integer number (9919062).

Almost surely, 2^19838123 is an apocalyptic number.

19838123 is a deficient number, since it is larger than the sum of its proper divisors (1).

19838123 is an equidigital number, since it uses as much as digits as its factorization.

19838123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 35.

The square root of 19838123 is about 4454.0007858104. Note that the first 3 decimals coincide. The cubic root of 19838123 is about 270.7074406193.

The spelling of 19838123 in words is "nineteen million, eight hundred thirty-eight thousand, one hundred twenty-three".