1387726929 has 6 divisors (see below), whose sum is σ = 2004494466. Its totient is φ = 925151280.

The previous prime is 1387726927. The next prime is 1387726957. The reversal of 1387726929 is 9296277831.

It can be written as a sum of positive squares in only one way, i.e., 1113890625 + 273836304 = 33375^2 + 16548^2 .

It is not a de Polignac number, because 1387726929 - 2¹ = 1387726927 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1387726927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77095932 + ... + 77095949.

It is an arithmetic number, because the mean of its divisors is an integer number (334082411).

Almost surely, 2^1387726929 is an apocalyptic number.

It is an amenable number.

1387726929 is a deficient number, since it is larger than the sum of its proper divisors (616767537).

1387726929 is a wasteful number, since it uses less digits than its factorization.

1387726929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154191887 (or 154191884 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 1387726929 is about 37252.2070352885. The cubic root of 1387726929 is about 1115.4103549672.

The spelling of 1387726929 in words is "one billion, three hundred eighty-seven million, seven hundred twenty-six thousand, nine hundred twenty-nine".