1220432243 has 4 divisors (see below), whose sum is σ = 1220505048. Its totient is φ = 1220359440.

The previous prime is 1220432231. The next prime is 1220432267. The reversal of 1220432243 is 3422340221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3422340221 = 53 ⋅64572457.

It is a cyclic number.

It is not a de Polignac number, because 1220432243 - 2⁶ = 1220432179 is a prime.

It is a super-3 number, since 3×1220432243³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220432293) 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, 2855 + ... + 49487.

It is an arithmetic number, because the mean of its divisors is an integer number (305126262).

Almost surely, 2^1220432243 is an apocalyptic number.

1220432243 is a deficient number, since it is larger than the sum of its proper divisors (72805).

1220432243 is an equidigital number, since it uses as much as digits as its factorization.

1220432243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72804.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 1220432243 is about 34934.6853857309. The cubic root of 1220432243 is about 1068.6559077339.

Adding to 1220432243 its reverse (3422340221), we get a palindrome (4642772464).

The spelling of 1220432243 in words is "one billion, two hundred twenty million, four hundred thirty-two thousand, two hundred forty-three".