1387726216 has 8 divisors (see below), whose sum is σ = 2601986670. Its totient is φ = 693863104.

The previous prime is 1387726213. The next prime is 1387726259. The reversal of 1387726216 is 6126277831.

It can be written as a sum of positive squares in only one way, i.e., 1013148900 + 374577316 = 31830^2 + 19354^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1387726213) 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 as a sum of consecutive naturals, namely, 86732881 + ... + 86732896.

Almost surely, 2^1387726216 is an apocalyptic number.

It is an amenable number.

1387726216 is a deficient number, since it is larger than the sum of its proper divisors (1214260454).

1387726216 is a wasteful number, since it uses less digits than its factorization.

1387726216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173465783 (or 173465779 counting only the distinct ones).

The product of its digits is 169344, while the sum is 43.

The square root of 1387726216 is about 37252.1974653845. The cubic root of 1387726216 is about 1115.4101639383.

The spelling of 1387726216 in words is "one billion, three hundred eighty-seven million, seven hundred twenty-six thousand, two hundred sixteen".