1245220 has 24 divisors (see below), whose sum is σ = 2729664. Its totient is φ = 476256.

The previous prime is 1245217. The next prime is 1245227. The reversal of 1245220 is 225421.

It is a junction number, because it is equal to n+sod(n) for n = 1245194 and 1245203.

It is not an unprimeable number, because it can be changed into a prime (1245227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 894 + ... + 1813.

It is an arithmetic number, because the mean of its divisors is an integer number (113736).

2^1245220 is an apocalyptic number.

1245220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245220 is an abundant number, since it is smaller than the sum of its proper divisors (1484444).

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

1245220 is a wasteful number, since it uses less digits than its factorization.

1245220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2739 (or 2737 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 1245220 is about 1115.8942602236. The cubic root of 1245220 is about 107.5842498010.

The spelling of 1245220 in words is "one million, two hundred forty-five thousand, two hundred twenty".