1238744993 has 2 divisors, whose sum is σ = 1238744994. Its totient is φ = 1238744992.

The previous prime is 1238744939. The next prime is 1238745007. The reversal of 1238744993 is 3994478321.

Together with previous prime (1238744939) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 793661584 + 445083409 = 28172^2 + 21097^2 .

It is a cyclic number.

It is not a de Polignac number, because 1238744993 - 2¹² = 1238740897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1238744893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619372496 + 619372497.

It is an arithmetic number, because the mean of its divisors is an integer number (619372497).

Almost surely, 2^1238744993 is an apocalyptic number.

It is an amenable number.

1238744993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1238744993 is an equidigital number, since it uses as much as digits as its factorization.

1238744993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 50.

The square root of 1238744993 is about 35195.8093102006. The cubic root of 1238744993 is about 1073.9745022596.

The spelling of 1238744993 in words is "one billion, two hundred thirty-eight million, seven hundred forty-four thousand, nine hundred ninety-three".