1220755 has 8 divisors (see below), whose sum is σ = 1515600. Its totient is φ = 942816.

The previous prime is 1220743. The next prime is 1220761. The reversal of 1220755 is 5570221.

1220755 = 191² + 192² + ... + 219².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220755 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4065 + ... + 4354.

It is an arithmetic number, because the mean of its divisors is an integer number (189450).

2^1220755 is an apocalyptic number.

1220755 is a deficient number, since it is larger than the sum of its proper divisors (294845).

1220755 is an equidigital number, since it uses as much as digits as its factorization.

1220755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8453.

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 1220755 is about 1104.8778212997. The cubic root of 1220755 is about 106.8750105446.

Adding to 1220755 its reverse (5570221), we get a palindrome (6790976).

The spelling of 1220755 in words is "one million, two hundred twenty thousand, seven hundred fifty-five".