1220735 has 4 divisors (see below), whose sum is σ = 1464888. Its totient is φ = 976584.

The previous prime is 1220729. The next prime is 1220743. The reversal of 1220735 is 5370221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5370221 = 41 ⋅130981.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220735 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122069 + ... + 122078.

It is an arithmetic number, because the mean of its divisors is an integer number (366222).

2^1220735 is an apocalyptic number.

1220735 is a deficient number, since it is larger than the sum of its proper divisors (244153).

1220735 is an equidigital number, since it uses as much as digits as its factorization.

1220735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244152.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 1220735 is about 1104.8687704882. The cubic root of 1220735 is about 106.8744268861.

Adding to 1220735 its reverse (5370221), we get a palindrome (6590956).

The spelling of 1220735 in words is "one million, two hundred twenty thousand, seven hundred thirty-five".