1387946816 has 14 divisors (see below), whose sum is σ = 2754207090. Its totient is φ = 693973376.

The previous prime is 1387946797. The next prime is 1387946821. The reversal of 1387946816 is 6186497831.

It can be written as a sum of positive squares in only one way, i.e., 1376113216 + 11833600 = 37096^2 + 3440^2 .

It is a congruent number.

It is an unprimeable number.

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, 10843271 + ... + 10843398.

Almost surely, 2^1387946816 is an apocalyptic number.

1387946816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1387946816 is a deficient number, since it is larger than the sum of its proper divisors (1366260274).

1387946816 is an equidigital number, since it uses as much as digits as its factorization.

1387946816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21686681 (or 21686671 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 53.

The square root of 1387946816 is about 37255.1582468790. The cubic root of 1387946816 is about 1115.4692645597.

The spelling of 1387946816 in words is "one billion, three hundred eighty-seven million, nine hundred forty-six thousand, eight hundred sixteen".