12543550 has 12 divisors (see below), whose sum is σ = 23331096. Its totient is φ = 5017400.

The previous prime is 12543529. The next prime is 12543551. The reversal of 12543550 is 5534521.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12543551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 125386 + ... + 125485.

It is an arithmetic number, because the mean of its divisors is an integer number (1944258).

Almost surely, 2^12543550 is an apocalyptic number.

12543550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12543550 is a deficient number, since it is larger than the sum of its proper divisors (10787546).

12543550 is a wasteful number, since it uses less digits than its factorization.

12543550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250883 (or 250878 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 12543550 is about 3541.6874509194. The cubic root of 12543550 is about 232.3486508723.

The spelling of 12543550 in words is "twelve million, five hundred forty-three thousand, five hundred fifty".