19478 has 4 divisors (see below), whose sum is σ = 29220. Its totient is φ = 9738.

The previous prime is 19477. The next prime is 19483. The reversal of 19478 is 87491.

It is a semiprime because it is the product of two primes.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 19478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4868 + ... + 4871.

It is an arithmetic number, because the mean of its divisors is an integer number (7305).

2¹⁹⁴⁷⁸ is an apocalyptic number.

19478 is a deficient number, since it is larger than the sum of its proper divisors (9742).

19478 is an equidigital number, since it uses as much as digits as its factorization.

19478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9741.

The product of its digits is 2016, while the sum is 29.

The square root of 19478 is about 139.5636055711. The cubic root of 19478 is about 26.9059369713.

It can be divided in two parts, 1947 and 8, that multiplied together give a triangular number (15576 = T₁₇₆).

The spelling of 19478 in words is "nineteen thousand, four hundred seventy-eight".