19804234 has 4 divisors (see below), whose sum is σ = 29706354. Its totient is φ = 9902116.

The previous prime is 19804231. The next prime is 19804237. The reversal of 19804234 is 43240891.

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

It is an interprime number because it is at equal distance from previous prime (19804231) and next prime (19804237).

It can be written as a sum of positive squares in only one way, i.e., 18948609 + 855625 = 4353^2 + 925^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 19804196 and 19804205.

It is not an unprimeable number, because it can be changed into a prime (19804231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4951057 + ... + 4951060.

Almost surely, 2^19804234 is an apocalyptic number.

19804234 is a deficient number, since it is larger than the sum of its proper divisors (9902120).

19804234 is an equidigital number, since it uses as much as digits as its factorization.

19804234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9902119.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 19804234 is about 4450.1948271958. The cubic root of 19804234 is about 270.5532050375.

The spelling of 19804234 in words is "nineteen million, eight hundred four thousand, two hundred thirty-four".