1388999377 has 2 divisors, whose sum is σ = 1388999378. Its totient is φ = 1388999376.

The previous prime is 1388999327. The next prime is 1388999387. The reversal of 1388999377 is 7739998831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 809345601 + 579653776 = 28449^2 + 24076^2 .

It is a cyclic number.

It is not a de Polignac number, because 1388999377 - 2¹¹ = 1388997329 is a prime.

It is not a weakly prime, because it can be changed into another prime (1388999327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694499688 + 694499689.

It is an arithmetic number, because the mean of its divisors is an integer number (694499689).

Almost surely, 2^1388999377 is an apocalyptic number.

It is an amenable number.

1388999377 is a deficient number, since it is larger than the sum of its proper divisors (1).

1388999377 is an equidigital number, since it uses as much as digits as its factorization.

1388999377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20575296, while the sum is 64.

The square root of 1388999377 is about 37269.2819490797. The cubic root of 1388999377 is about 1115.7511684387.

The spelling of 1388999377 in words is "one billion, three hundred eighty-eight million, nine hundred ninety-nine thousand, three hundred seventy-seven".