1220775 has 24 divisors (see below), whose sum is σ = 2072784. Its totient is φ = 633600.

The previous prime is 1220773. The next prime is 1220777. The reversal of 1220775 is 5770221.

It is an interprime number because it is at equal distance from previous prime (1220773) and next prime (1220777).

It is not a de Polignac number, because 1220775 - 2¹ = 1220773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220773) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2877 + ... + 3273.

It is an arithmetic number, because the mean of its divisors is an integer number (86366).

2^1220775 is an apocalyptic number.

1220775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1220775 is a deficient number, since it is larger than the sum of its proper divisors (852009).

1220775 is a wasteful number, since it uses less digits than its factorization.

1220775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451 (or 446 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 24.

The square root of 1220775 is about 1104.8868720371. The cubic root of 1220775 is about 106.8755941966.

Adding to 1220775 its reverse (5770221), we get a palindrome (6990996).

The spelling of 1220775 in words is "one million, two hundred twenty thousand, seven hundred seventy-five".