19425478 has 16 divisors (see below), whose sum is σ = 30593376. Its totient is φ = 9232960.

The previous prime is 19425449. The next prime is 19425479. The reversal of 19425478 is 87452491.

It is a self number, because there is not a number n which added to its sum of digits gives 19425478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19425479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6738 + ... + 9178.

It is an arithmetic number, because the mean of its divisors is an integer number (1912086).

It is a vampire number, since it can be written as 2441 ⋅ 7958 (with its own digits).

Almost surely, 2^19425478 is an apocalyptic number.

19425478 is a deficient number, since it is larger than the sum of its proper divisors (11167898).

19425478 is a wasteful number, since it uses less digits than its factorization.

19425478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2639.

The product of its digits is 80640, while the sum is 40.

The square root of 19425478 is about 4407.4344011000. The cubic root of 19425478 is about 268.8173144524.

The spelling of 19425478 in words is "nineteen million, four hundred twenty-five thousand, four hundred seventy-eight".