1220540 has 12 divisors (see below), whose sum is σ = 2563176. Its totient is φ = 488208.

The previous prime is 1220507. The next prime is 1220591. The reversal of 1220540 is 450221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30494 + ... + 30533.

It is an arithmetic number, because the mean of its divisors is an integer number (213598).

2^1220540 is an apocalyptic number.

1220540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220540 is an abundant number, since it is smaller than the sum of its proper divisors (1342636).

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

1220540 is a wasteful number, since it uses less digits than its factorization.

1220540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61036 (or 61034 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 1220540 is about 1104.7805211896. The cubic root of 1220540 is about 106.8687358822.

Adding to 1220540 its reverse (450221), we get a palindrome (1670761).

The spelling of 1220540 in words is "one million, two hundred twenty thousand, five hundred forty".