12891620 has 24 divisors (see below), whose sum is σ = 30940224. Its totient is φ = 4419936.

The previous prime is 12891607. The next prime is 12891623. The reversal of 12891620 is 2619821.

12891620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (12891623) 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, 45902 + ... + 46181.

It is an arithmetic number, because the mean of its divisors is an integer number (1289176).

Almost surely, 2^12891620 is an apocalyptic number.

12891620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12891620 is an abundant number, since it is smaller than the sum of its proper divisors (18048604).

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

12891620 is a wasteful number, since it uses less digits than its factorization.

12891620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92099 (or 92097 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 12891620 is about 3590.4902172266. The cubic root of 12891620 is about 234.4782145691.

The spelling of 12891620 in words is "twelve million, eight hundred ninety-one thousand, six hundred twenty".