19992123 has 16 divisors (see below), whose sum is σ = 31177600. Its totient is φ = 12626280.

The previous prime is 19992103. The next prime is 19992131. The reversal of 19992123 is 32129991.

It is a happy number.

It is not a de Polignac number, because 19992123 - 2⁶ = 19992059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19992103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18973 + ... + 19998.

It is an arithmetic number, because the mean of its divisors is an integer number (1948600).

Almost surely, 2^19992123 is an apocalyptic number.

19992123 is a deficient number, since it is larger than the sum of its proper divisors (11185477).

19992123 is a wasteful number, since it uses less digits than its factorization.

19992123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38999 (or 38993 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 19992123 is about 4471.2551928961. The cubic root of 19992123 is about 271.4061212008.

The spelling of 19992123 in words is "nineteen million, nine hundred ninety-two thousand, one hundred twenty-three".