12691830 has 16 divisors (see below), whose sum is σ = 30460464. Its totient is φ = 3384480.

The previous prime is 12691823. The next prime is 12691831. The reversal of 12691830 is 3819621.

12691830 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12691830² = 322165097497800, which contains 22 as substring.

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: 423061 = 12691830 / (1 + 2 + 6 + 9 + 1 + 8 + 3 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12691831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211501 + ... + 211560.

It is an arithmetic number, because the mean of its divisors is an integer number (1903779).

Almost surely, 2^12691830 is an apocalyptic number.

12691830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12691830 is an abundant number, since it is smaller than the sum of its proper divisors (17768634).

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

12691830 is a wasteful number, since it uses less digits than its factorization.

12691830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423071.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 12691830 is about 3562.5594731878. The cubic root of 12691830 is about 233.2606145276.

The spelling of 12691830 in words is "twelve million, six hundred ninety-one thousand, eight hundred thirty".