19873428 has 12 divisors (see below), whose sum is σ = 46371360. Its totient is φ = 6624472.

The previous prime is 19873421. The next prime is 19873429. The reversal of 19873428 is 82437891.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 19873428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19873421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 828048 + ... + 828071.

It is an arithmetic number, because the mean of its divisors is an integer number (3864280).

Almost surely, 2^19873428 is an apocalyptic number.

It is an amenable number.

19873428 is an abundant number, since it is smaller than the sum of its proper divisors (26497932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19873428 is a wasteful number, since it uses less digits than its factorization.

19873428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656126 (or 1656124 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 19873428 is about 4457.9623147802. The cubic root of 19873428 is about 270.8679339988.

It can be divided in two parts, 19873 and 428, that added together give a triangular number (20301 = T₂₀₁).

The spelling of 19873428 in words is "nineteen million, eight hundred seventy-three thousand, four hundred twenty-eight".