1220775743 has 16 divisors (see below), whose sum is σ = 1369670784. Its totient is φ = 1078284960.

The previous prime is 1220775739. The next prime is 1220775767. The reversal of 1220775743 is 3475770221.

It is a cyclic number.

It is not a de Polignac number, because 1220775743 - 2² = 1220775739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220775697 and 1220775706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220775713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 367496 + ... + 370802.

It is an arithmetic number, because the mean of its divisors is an integer number (85604424).

Almost surely, 2^1220775743 is an apocalyptic number.

1220775743 is a deficient number, since it is larger than the sum of its proper divisors (148895041).

1220775743 is a wasteful number, since it uses less digits than its factorization.

1220775743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4262.

The product of its (nonzero) digits is 82320, while the sum is 38.

The square root of 1220775743 is about 34939.6013571993. The cubic root of 1220775743 is about 1068.7561587917.

The spelling of 1220775743 in words is "one billion, two hundred twenty million, seven hundred seventy-five thousand, seven hundred forty-three".