1387187377 has 2 divisors, whose sum is σ = 1387187378. Its totient is φ = 1387187376.

The previous prime is 1387187323. The next prime is 1387187407. The reversal of 1387187377 is 7737817831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1159811136 + 227376241 = 34056^2 + 15079^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387187377 - 2¹⁵ = 1387154609 is a prime.

It is not a weakly prime, because it can be changed into another prime (1387187177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693593688 + 693593689.

It is an arithmetic number, because the mean of its divisors is an integer number (693593689).

Almost surely, 2^1387187377 is an apocalyptic number.

It is an amenable number.

1387187377 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387187377 is an equidigital number, since it uses as much as digits as its factorization.

1387187377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1382976, while the sum is 52.

The square root of 1387187377 is about 37244.9644515873. The cubic root of 1387187377 is about 1115.2657780362.

The spelling of 1387187377 in words is "one billion, three hundred eighty-seven million, one hundred eighty-seven thousand, three hundred seventy-seven".