1220065403 has 4 divisors (see below), whose sum is σ = 1221548688. Its totient is φ = 1218582120.

The previous prime is 1220065397. The next prime is 1220065501. The reversal of 1220065403 is 3045600221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1220065403 - 2¹⁰ = 1220064379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220065103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 740408 + ... + 742053.

It is an arithmetic number, because the mean of its divisors is an integer number (305387172).

Almost surely, 2^1220065403 is an apocalyptic number.

1220065403 is a deficient number, since it is larger than the sum of its proper divisors (1483285).

1220065403 is an equidigital number, since it uses as much as digits as its factorization.

1220065403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483284.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1220065403 is about 34929.4346218200. The cubic root of 1220065403 is about 1068.5488240836.

Adding to 1220065403 its reverse (3045600221), we get a palindrome (4265665624).

The spelling of 1220065403 in words is "one billion, two hundred twenty million, sixty-five thousand, four hundred three".