19992427 has 32 divisors (see below), whose sum is σ = 26808320. Its totient is φ = 14463360.

The previous prime is 19992419. The next prime is 19992431. The reversal of 19992427 is 72429991.

It is not a de Polignac number, because 19992427 - 2³ = 19992419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19992407) 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 31 ways as a sum of consecutive naturals, for example, 53413 + ... + 53785.

It is an arithmetic number, because the mean of its divisors is an integer number (837760).

Almost surely, 2^19992427 is an apocalyptic number.

19992427 is the 2582-nd hex number.

19992427 is a deficient number, since it is larger than the sum of its proper divisors (6815893).

19992427 is a wasteful number, since it uses less digits than its factorization.

19992427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443.

The product of its digits is 81648, while the sum is 43.

The square root of 19992427 is about 4471.2891876952. The cubic root of 19992427 is about 271.4074968600.

The spelling of 19992427 in words is "nineteen million, nine hundred ninety-two thousand, four hundred twenty-seven".