1225980 has 108 divisors (see below), whose sum is σ = 4357080. Its totient is φ = 278208.

The previous prime is 1225963. The next prime is 1225981. The reversal of 1225980 is 895221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225981) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8751 + ... + 8889.

2^1225980 is an apocalyptic number.

1225980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1225980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2178540).

1225980 is an abundant number, since it is smaller than the sum of its proper divisors (3131100).

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

1225980 is a wasteful number, since it uses less digits than its factorization.

1225980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1225980 is about 1107.2398114230. The cubic root of 1225980 is about 107.0272734506.

The spelling of 1225980 in words is "one million, two hundred twenty-five thousand, nine hundred eighty".