1387928293 has 2 divisors, whose sum is σ = 1387928294. Its totient is φ = 1387928292.

The previous prime is 1387928287. The next prime is 1387928309. The reversal of 1387928293 is 3928297831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1367298529 + 20629764 = 36977^2 + 4542^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387928293 - 2²⁹ = 851057381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1387928293.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1387928393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693964146 + 693964147.

It is an arithmetic number, because the mean of its divisors is an integer number (693964147).

Almost surely, 2^1387928293 is an apocalyptic number.

It is an amenable number.

1387928293 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387928293 is an equidigital number, since it uses as much as digits as its factorization.

1387928293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 52.

The square root of 1387928293 is about 37254.9096496019. The cubic root of 1387928293 is about 1115.4643023309.

The spelling of 1387928293 in words is "one billion, three hundred eighty-seven million, nine hundred twenty-eight thousand, two hundred ninety-three".