19434728 has 8 divisors (see below), whose sum is σ = 36440130. Its totient is φ = 9717360.

The previous prime is 19434721. The next prime is 19434733. The reversal of 19434728 is 82743491.

It can be written as a sum of positive squares in only one way, i.e., 18130564 + 1304164 = 4258^2 + 1142^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 19434691 and 19434700.

It is not an unprimeable number, because it can be changed into a prime (19434721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1214663 + ... + 1214678.

Almost surely, 2^19434728 is an apocalyptic number.

It is an amenable number.

19434728 is a deficient number, since it is larger than the sum of its proper divisors (17005402).

19434728 is a wasteful number, since it uses less digits than its factorization.

19434728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2429347 (or 2429343 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 19434728 is about 4408.4836395296. The cubic root of 19434728 is about 268.8599760466.

The spelling of 19434728 in words is "nineteen million, four hundred thirty-four thousand, seven hundred twenty-eight".