19128730 has 8 divisors (see below), whose sum is σ = 34431732. Its totient is φ = 7651488.

The previous prime is 19128727. The next prime is 19128743. The reversal of 19128730 is 3782191.

It can be written as a sum of positive squares in 2 ways, for example, as 15768841 + 3359889 = 3971^2 + 1833^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×19128730² = 731816622825800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19128692 and 19128701.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 956427 + ... + 956446.

Almost surely, 2^19128730 is an apocalyptic number.

19128730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19128730 is a deficient number, since it is larger than the sum of its proper divisors (15303002).

19128730 is a wasteful number, since it uses less digits than its factorization.

19128730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1912880.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 19128730 is about 4373.6403601577. The cubic root of 19128730 is about 267.4414464090.

The spelling of 19128730 in words is "nineteen million, one hundred twenty-eight thousand, seven hundred thirty".