1243440929 has 2 divisors, whose sum is σ = 1243440930. Its totient is φ = 1243440928.

The previous prime is 1243440899. The next prime is 1243440931. The reversal of 1243440929 is 9290443421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1186664704 + 56776225 = 34448^2 + 7535^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243440929 - 2²⁰ = 1242392353 is a prime.

It is a super-2 number, since 2×1243440929² = 3092290687824766082, which contains 22 as substring.

Together with 1243440931, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1243440892 and 1243440901.

It is not a weakly prime, because it can be changed into another prime (1243440949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621720464 + 621720465.

It is an arithmetic number, because the mean of its divisors is an integer number (621720465).

Almost surely, 2^1243440929 is an apocalyptic number.

It is an amenable number.

1243440929 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243440929 is an equidigital number, since it uses as much as digits as its factorization.

1243440929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 1243440929 is about 35262.4577844483. The cubic root of 1243440929 is about 1075.3298944975.

The spelling of 1243440929 in words is "one billion, two hundred forty-three million, four hundred forty thousand, nine hundred twenty-nine".