1243990829 has 2 divisors, whose sum is σ = 1243990830. Its totient is φ = 1243990828.

The previous prime is 1243990777. The next prime is 1243990859. The reversal of 1243990829 is 9280993421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1010604100 + 233386729 = 31790^2 + 15277^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243990829 is a prime.

It is a super-2 number, since 2×1243990829² = 3095026365272214482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243990859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621995414 + 621995415.

It is an arithmetic number, because the mean of its divisors is an integer number (621995415).

Almost surely, 2^1243990829 is an apocalyptic number.

It is an amenable number.

1243990829 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243990829 is an equidigital number, since it uses as much as digits as its factorization.

1243990829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 1243990829 is about 35270.2541669322. The cubic root of 1243990829 is about 1075.4883892968.

The spelling of 1243990829 in words is "one billion, two hundred forty-three million, nine hundred ninety thousand, eight hundred twenty-nine".