19428444 has 96 divisors (see below), whose sum is σ = 59494400. Its totient is φ = 5365440.

The previous prime is 19428443. The next prime is 19428449. The reversal of 19428444 is 44482491.

19428444 is a `hidden beast` number, since 194 + 28 + 444 = 666.

It is a super-2 number, since 2×19428444² = 754928872522272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 19428399 and 19428408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19428443) 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 31 ways as a sum of consecutive naturals, for example, 23022 + ... + 23850.

Almost surely, 2^19428444 is an apocalyptic number.

19428444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19428444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29747200).

19428444 is an abundant number, since it is smaller than the sum of its proper divisors (40065956).

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

19428444 is a wasteful number, since it uses less digits than its factorization.

19428444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880 (or 872 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 19428444 is about 4407.7708651880. The cubic root of 19428444 is about 268.8309953097.

The spelling of 19428444 in words is "nineteen million, four hundred twenty-eight thousand, four hundred forty-four".