1387903779 has 12 divisors (see below), whose sum is σ = 2073879600. Its totient is φ = 893363184.

The previous prime is 1387903763. The next prime is 1387903793. The reversal of 1387903779 is 9773097831.

It is a happy number.

It is not a de Polignac number, because 1387903779 - 2⁴ = 1387903763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1387903709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2658559 + ... + 2659080.

It is an arithmetic number, because the mean of its divisors is an integer number (172823300).

Almost surely, 2^1387903779 is an apocalyptic number.

1387903779 is a deficient number, since it is larger than the sum of its proper divisors (685975821).

1387903779 is a wasteful number, since it uses less digits than its factorization.

1387903779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5317674 (or 5317671 counting only the distinct ones).

The product of its (nonzero) digits is 2000376, while the sum is 54.

The square root of 1387903779 is about 37254.5806445328. The cubic root of 1387903779 is about 1115.4577350721.

The spelling of 1387903779 in words is "one billion, three hundred eighty-seven million, nine hundred three thousand, seven hundred seventy-nine".