1387487993 has 2 divisors, whose sum is σ = 1387487994. Its totient is φ = 1387487992.

The previous prime is 1387487989. The next prime is 1387488013. The reversal of 1387487993 is 3997847831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1107025984 + 280462009 = 33272^2 + 16747^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387487993 - 2² = 1387487989 is a prime.

It is not a weakly prime, because it can be changed into another prime (1387487093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693743996 + 693743997.

It is an arithmetic number, because the mean of its divisors is an integer number (693743997).

Almost surely, 2^1387487993 is an apocalyptic number.

It is an amenable number.

1387487993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387487993 is an equidigital number, since it uses as much as digits as its factorization.

1387487993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 59.

The square root of 1387487993 is about 37248.9998926146. Note that the first 3 decimals coincide. The cubic root of 1387487993 is about 1115.3463349307.

The spelling of 1387487993 in words is "one billion, three hundred eighty-seven million, four hundred eighty-seven thousand, nine hundred ninety-three".