1220280 has 32 divisors (see below), whose sum is σ = 3661200. Its totient is φ = 325376.

The previous prime is 1220257. The next prime is 1220309. The reversal of 1220280 is 820221.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4965 + ... + 5204.

2^1220280 is an apocalyptic number.

1220280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220280 is an abundant number, since it is smaller than the sum of its proper divisors (2440920).

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

1220280 is a wasteful number, since it uses less digits than its factorization.

1220280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10183 (or 10179 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1220280 is about 1104.6628444915. The cubic root of 1220280 is about 106.8611469340.

The spelling of 1220280 in words is "one million, two hundred twenty thousand, two hundred eighty".