12156550 has 48 divisors (see below), whose sum is σ = 26426880. Its totient is φ = 4073760.

The previous prime is 12156527. The next prime is 12156553. The reversal of 12156550 is 5565121.

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 (12156553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16081 + ... + 16819.

It is an arithmetic number, because the mean of its divisors is an integer number (550560).

Almost surely, 2^12156550 is an apocalyptic number.

12156550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12156550 is an abundant number, since it is smaller than the sum of its proper divisors (14270330).

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

12156550 is a wasteful number, since it uses less digits than its factorization.

12156550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805 (or 800 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 12156550 is about 3486.6244420643. The cubic root of 12156550 is about 229.9341336283.

The spelling of 12156550 in words is "twelve million, one hundred fifty-six thousand, five hundred fifty".