1221480 has 160 divisors (see below), whose sum is σ = 4573800. Its totient is φ = 290304.

The previous prime is 1221469. The next prime is 1221499. The reversal of 1221480 is 841221.

It can be written as a sum of positive squares in 4 ways, for example, as 777924 + 443556 = 882^2 + 666^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 42106 + ... + 42134.

2^1221480 is an apocalyptic number.

1221480 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 1221480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2286900).

1221480 is an abundant number, since it is smaller than the sum of its proper divisors (3352320).

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

1221480 is a wasteful number, since it uses less digits than its factorization.

1221480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65 (or 52 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1221480 is about 1105.2058631766. The cubic root of 1221480 is about 106.8961638605.

The spelling of 1221480 in words is "one million, two hundred twenty-one thousand, four hundred eighty".