1285748393 has 2 divisors, whose sum is σ = 1285748394. Its totient is φ = 1285748392.

The previous prime is 1285748383. The next prime is 1285748419. The reversal of 1285748393 is 3938475821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1152738304 + 133010089 = 33952^2 + 11533^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285748393 - 2⁸ = 1285748137 is a prime.

It is not a weakly prime, because it can be changed into another prime (1285748333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642874196 + 642874197.

It is an arithmetic number, because the mean of its divisors is an integer number (642874197).

Almost surely, 2^1285748393 is an apocalyptic number.

It is an amenable number.

1285748393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285748393 is an equidigital number, since it uses as much as digits as its factorization.

1285748393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 50.

The square root of 1285748393 is about 35857.3338802538. Note that the first 3 decimals coincide. The cubic root of 1285748393 is about 1087.3899882198.

The spelling of 1285748393 in words is "one billion, two hundred eighty-five million, seven hundred forty-eight thousand, three hundred ninety-three".