12643770 has 16 divisors (see below), whose sum is σ = 30345120. Its totient is φ = 3371664.

The previous prime is 12643723. The next prime is 12643781. The reversal of 12643770 is 7734621.

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: 421459 = 12643770 / (1 + 2 + 6 + 4 + 3 + 7 + 7 + 0).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210700 + ... + 210759.

It is an arithmetic number, because the mean of its divisors is an integer number (1896570).

Almost surely, 2^12643770 is an apocalyptic number.

12643770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12643770 is an abundant number, since it is smaller than the sum of its proper divisors (17701350).

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

12643770 is a wasteful number, since it uses less digits than its factorization.

12643770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421469.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 12643770 is about 3555.8079250713. The cubic root of 12643770 is about 232.9658137199.

The spelling of 12643770 in words is "twelve million, six hundred forty-three thousand, seven hundred seventy".