1243220253 has 8 divisors (see below), whose sum is σ = 1808320416. Its totient is φ = 753466800.

The previous prime is 1243220243. The next prime is 1243220269. The reversal of 1243220253 is 3520223421.

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

It is not a de Polignac number, because 1243220253 - 2²⁰ = 1242171677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243220203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18836638 + ... + 18836703.

It is an arithmetic number, because the mean of its divisors is an integer number (226040052).

Almost surely, 2^1243220253 is an apocalyptic number.

It is an amenable number.

1243220253 is a deficient number, since it is larger than the sum of its proper divisors (565100163).

1243220253 is a wasteful number, since it uses less digits than its factorization.

1243220253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37673355.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 1243220253 is about 35259.3285954228. The cubic root of 1243220253 is about 1075.2662770701.

Adding to 1243220253 its reverse (3520223421), we get a palindrome (4763443674).

The spelling of 1243220253 in words is "one billion, two hundred forty-three million, two hundred twenty thousand, two hundred fifty-three".