1244667889 has 2 divisors, whose sum is σ = 1244667890. Its totient is φ = 1244667888.

The previous prime is 1244667883. The next prime is 1244667913. The reversal of 1244667889 is 9887664421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1182809664 + 61858225 = 34392^2 + 7865^2 .

It is a cyclic number.

It is not a de Polignac number, because 1244667889 - 2³ = 1244667881 is a prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (1244667881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622333944 + 622333945.

It is an arithmetic number, because the mean of its divisors is an integer number (622333945).

Almost surely, 2^1244667889 is an apocalyptic number.

It is an amenable number.

1244667889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244667889 is an equidigital number, since it uses as much as digits as its factorization.

1244667889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4644864, while the sum is 55.

The square root of 1244667889 is about 35279.8510342660. The cubic root of 1244667889 is about 1075.6834706125.

It can be divided in two parts, 124466 and 7889, that added together give a triangular number (132355 = T₅₁₄).

The spelling of 1244667889 in words is "one billion, two hundred forty-four million, six hundred sixty-seven thousand, eight hundred eighty-nine".