12275550 has 120 divisors (see below), whose sum is σ = 39070416. Its totient is φ = 2799360.

The previous prime is 12275509. The next prime is 12275567. The reversal of 12275550 is 5557221.

It is a happy number.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 28134 + ... + 28566.

Almost surely, 2^12275550 is an apocalyptic number.

12275550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12275550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19535208).

12275550 is an abundant number, since it is smaller than the sum of its proper divisors (26794866).

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

12275550 is a wasteful number, since it uses less digits than its factorization.

12275550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 12275550 is about 3503.6480987679. The cubic root of 12275550 is about 230.6819708550.

The spelling of 12275550 in words is "twelve million, two hundred seventy-five thousand, five hundred fifty".