19012423 has 4 divisors (see below), whose sum is σ = 19157688. Its totient is φ = 18867160.

The previous prime is 19012381. The next prime is 19012439. The reversal of 19012423 is 32421091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32421091 = 17 ⋅1907123.

It is a cyclic number.

It is not a de Polignac number, because 19012423 - 2¹³ = 19004231 is a prime.

It is a super-2 number, since 2×19012423² = 722944456661858, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19012394 and 19012403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19012463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72436 + ... + 72697.

It is an arithmetic number, because the mean of its divisors is an integer number (4789422).

Almost surely, 2^19012423 is an apocalyptic number.

19012423 is a deficient number, since it is larger than the sum of its proper divisors (145265).

19012423 is a wasteful number, since it uses less digits than its factorization.

19012423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145264.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 19012423 is about 4360.3237265139. The cubic root of 19012423 is about 266.8983093133.

The spelling of 19012423 in words is "nineteen million, twelve thousand, four hundred twenty-three".