1225100 has 18 divisors (see below), whose sum is σ = 2658684. Its totient is φ = 490000.

The previous prime is 1225099. The next prime is 1225109. The reversal of 1225100 is 15221.

It is not an unprimeable number, because it can be changed into a prime (1225109) 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, 6026 + ... + 6225.

2^1225100 is an apocalyptic number.

1225100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225100 is an abundant number, since it is smaller than the sum of its proper divisors (1433584).

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

1225100 is a wasteful number, since it uses less digits than its factorization.

1225100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12265 (or 12258 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 1225100 is about 1106.8423555322. The cubic root of 1225100 is about 107.0016595078.

The spelling of 1225100 in words is "one million, two hundred twenty-five thousand, one hundred".