1244402213 has 4 divisors (see below), whose sum is σ = 1244472768. Its totient is φ = 1244331660.

The previous prime is 1244402197. The next prime is 1244402219. The reversal of 1244402213 is 3122044421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1244402213 - 2⁴ = 1244402197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244402219) by changing a digit.

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, 17258 + ... + 52788.

It is an arithmetic number, because the mean of its divisors is an integer number (311118192).

Almost surely, 2^1244402213 is an apocalyptic number.

It is an amenable number.

1244402213 is a deficient number, since it is larger than the sum of its proper divisors (70555).

1244402213 is an equidigital number, since it uses as much as digits as its factorization.

1244402213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70554.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1244402213 is about 35276.0855679878. The cubic root of 1244402213 is about 1075.6069298152.

Adding to 1244402213 its reverse (3122044421), we get a palindrome (4366446634).

The spelling of 1244402213 in words is "one billion, two hundred forty-four million, four hundred two thousand, two hundred thirteen".