12991530 has 16 divisors (see below), whose sum is σ = 31179744. Its totient is φ = 3464400.

The previous prime is 12991523. The next prime is 12991541. The reversal of 12991530 is 3519921.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 433051 = 12991530 / (1 + 2 + 9 + 9 + 1 + 5 + 3 + 0).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216496 + ... + 216555.

It is an arithmetic number, because the mean of its divisors is an integer number (1948734).

Almost surely, 2^12991530 is an apocalyptic number.

12991530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12991530 is an abundant number, since it is smaller than the sum of its proper divisors (18188214).

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

12991530 is a wasteful number, since it uses less digits than its factorization.

12991530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433061.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 12991530 is about 3604.3765064155. The cubic root of 12991530 is about 235.0823915114.

It can be divided in two parts, 129 and 91530, that multiplied together give a triangular number (11807370 = T₄₈₅₉).

The spelling of 12991530 in words is "twelve million, nine hundred ninety-one thousand, five hundred thirty".