12891630 has 64 divisors (see below), whose sum is σ = 32514048. Its totient is φ = 3267840.

The previous prime is 12891623. The next prime is 12891647. The reversal of 12891630 is 3619821.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57699 + ... + 57921.

It is an arithmetic number, because the mean of its divisors is an integer number (508032).

Almost surely, 2^12891630 is an apocalyptic number.

12891630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12891630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16257024).

12891630 is an abundant number, since it is smaller than the sum of its proper divisors (19622418).

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

12891630 is a wasteful number, since it uses less digits than its factorization.

12891630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321.

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

The square root of 12891630 is about 3590.4916097938. The cubic root of 12891630 is about 234.4782751972.

The spelling of 12891630 in words is "twelve million, eight hundred ninety-one thousand, six hundred thirty".