1387357243 has 2 divisors, whose sum is σ = 1387357244. Its totient is φ = 1387357242.

The previous prime is 1387357241. The next prime is 1387357247. The reversal of 1387357243 is 3427537831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1387357243 - 2¹ = 1387357241 is a prime.

It is a super-2 number, since 2×1387357243² = 3849520239409122098, which contains 22 as substring.

Together with 1387357241, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1387357243.

It is not a weakly prime, because it can be changed into another prime (1387357241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693678621 + 693678622.

It is an arithmetic number, because the mean of its divisors is an integer number (693678622).

Almost surely, 2^1387357243 is an apocalyptic number.

1387357243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387357243 is an equidigital number, since it uses as much as digits as its factorization.

1387357243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 43.

The square root of 1387357243 is about 37247.2447705867. The cubic root of 1387357243 is about 1115.3112989244.

The spelling of 1387357243 in words is "one billion, three hundred eighty-seven million, three hundred fifty-seven thousand, two hundred forty-three".