13128730 has 8 divisors (see below), whose sum is σ = 23631732. Its totient is φ = 5251488.

The previous prime is 13128727. The next prime is 13128737. The reversal of 13128730 is 3782131.

It can be written as a sum of positive squares in 2 ways, for example, as 13126129 + 2601 = 3623^2 + 51^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 13128695 and 13128704.

It is not an unprimeable number, because it can be changed into a prime (13128737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 656427 + ... + 656446.

Almost surely, 2^13128730 is an apocalyptic number.

13128730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13128730 is a deficient number, since it is larger than the sum of its proper divisors (10503002).

13128730 is a wasteful number, since it uses less digits than its factorization.

13128730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312880.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 13128730 is about 3623.3589388853. The cubic root of 13128730 is about 235.9070422944.

The spelling of 13128730 in words is "thirteen million, one hundred twenty-eight thousand, seven hundred thirty".