19000730 has 48 divisors (see below), whose sum is σ = 42143976. Its totient is φ = 6128640.

The previous prime is 19000717. The next prime is 19000733. The reversal of 19000730 is 3700091.

It can be written as a sum of positive squares in 4 ways, for example, as 17698849 + 1301881 = 4207^2 + 1141^2 .

It is a super-2 number, since 2×19000730² = 722055481065800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19000733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7190 + ... + 9470.

Almost surely, 2^19000730 is an apocalyptic number.

19000730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19000730 is an abundant number, since it is smaller than the sum of its proper divisors (23143246).

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

19000730 is a wasteful number, since it uses less digits than its factorization.

19000730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2319 (or 2312 counting only the distinct ones).

The product of its (nonzero) digits is 189, while the sum is 20.

The square root of 19000730 is about 4358.9826794792. The cubic root of 19000730 is about 266.8435822551.

The spelling of 19000730 in words is "nineteen million, seven hundred thirty", and thus it is an aban number.