1286220 has 96 divisors (see below), whose sum is σ = 4148928. Its totient is φ = 294912.

The previous prime is 1286209. The next prime is 1286227. The reversal of 1286220 is 226821.

It is not an unprimeable number, because it can be changed into a prime (1286227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13212 + ... + 13308.

It is an arithmetic number, because the mean of its divisors is an integer number (43218).

2^1286220 is an apocalyptic number.

1286220 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 1286220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2074464).

1286220 is an abundant number, since it is smaller than the sum of its proper divisors (2862708).

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

1286220 is a wasteful number, since it uses less digits than its factorization.

1286220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 1286220 is about 1134.1163961428. The cubic root of 1286220 is about 108.7522921964.

The spelling of 1286220 in words is "one million, two hundred eighty-six thousand, two hundred twenty".