12643554 has 32 divisors (see below), whose sum is σ = 31527936. Its totient is φ = 3283920.

The previous prime is 12643549. The next prime is 12643571. The reversal of 12643554 is 45534621.

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 15 ways as a sum of consecutive naturals, for example, 13222 + ... + 14145.

It is an arithmetic number, because the mean of its divisors is an integer number (985248).

Almost surely, 2^12643554 is an apocalyptic number.

12643554 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

12643554 is an abundant number, since it is smaller than the sum of its proper divisors (18884382).

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

12643554 is a wasteful number, since it uses less digits than its factorization.

12643554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27390.

The product of its digits is 14400, while the sum is 30.

The square root of 12643554 is about 3555.7775520974. Note that the first 3 decimals coincide. The cubic root of 12643554 is about 232.9644870876.

The spelling of 12643554 in words is "twelve million, six hundred forty-three thousand, five hundred fifty-four".