19425887 has 4 divisors (see below), whose sum is σ = 20920200. Its totient is φ = 17931576.

The previous prime is 19425839. The next prime is 19425893. The reversal of 19425887 is 78852491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78852491 = 769 ⋅102539.

It is not a de Polignac number, because 19425887 - 2¹² = 19421791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19425827) 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 3 ways as a sum of consecutive naturals, for example, 747137 + ... + 747162.

It is an arithmetic number, because the mean of its divisors is an integer number (5230050).

Almost surely, 2^19425887 is an apocalyptic number.

19425887 is a deficient number, since it is larger than the sum of its proper divisors (1494313).

19425887 is a wasteful number, since it uses less digits than its factorization.

19425887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494312.

The product of its digits is 161280, while the sum is 44.

The square root of 19425887 is about 4407.4807997313. The cubic root of 19425887 is about 268.8192010728.

The spelling of 19425887 in words is "nineteen million, four hundred twenty-five thousand, eight hundred eighty-seven".