1243745039 has 2 divisors, whose sum is σ = 1243745040. Its totient is φ = 1243745038.

The previous prime is 1243744993. The next prime is 1243745081. The reversal of 1243745039 is 9305473421.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243745039 is a prime.

It is a super-2 number, since 2×1243745039² = 3093803444074223042, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1243744993 and 1243745011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243747039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621872519 + 621872520.

It is an arithmetic number, because the mean of its divisors is an integer number (621872520).

Almost surely, 2^1243745039 is an apocalyptic number.

1243745039 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243745039 is an equidigital number, since it uses as much as digits as its factorization.

1243745039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 1243745039 is about 35266.7696139014. The cubic root of 1243745039 is about 1075.4175523054.

The spelling of 1243745039 in words is "one billion, two hundred forty-three million, seven hundred forty-five thousand, thirty-nine".