1387229377 has 2 divisors, whose sum is σ = 1387229378. Its totient is φ = 1387229376.

The previous prime is 1387229353. The next prime is 1387229399. The reversal of 1387229377 is 7739227831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1323213376 + 64016001 = 36376^2 + 8001^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1387229377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1387229377.

It is not a weakly prime, because it can be changed into another prime (1387229317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693614688 + 693614689.

It is an arithmetic number, because the mean of its divisors is an integer number (693614689).

Almost surely, 2^1387229377 is an apocalyptic number.

It is an amenable number.

1387229377 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387229377 is an equidigital number, since it uses as much as digits as its factorization.

1387229377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 889056, while the sum is 49.

The square root of 1387229377 is about 37245.5282819294. The cubic root of 1387229377 is about 1115.2770335909.

The spelling of 1387229377 in words is "one billion, three hundred eighty-seven million, two hundred twenty-nine thousand, three hundred seventy-seven".