1391216128 has 20 divisors (see below), whose sum is σ = 2779716060. Its totient is φ = 695607808.

The previous prime is 1391216089. The next prime is 1391216143. The reversal of 1391216128 is 8216121931.

It is a junction number, because it is equal to n+sod(n) for n = 1391216093 and 1391216102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1358098 + ... + 1359121.

It is an arithmetic number, because the mean of its divisors is an integer number (138985803).

Almost surely, 2^1391216128 is an apocalyptic number.

It is an amenable number.

1391216128 is a deficient number, since it is larger than the sum of its proper divisors (1388499932).

1391216128 is an frugal number, since it uses more digits than its factorization.

1391216128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2717237 (or 2717221 counting only the distinct ones).

The product of its digits is 5184, while the sum is 34.

The square root of 1391216128 is about 37299.0097455683. The cubic root of 1391216128 is about 1116.3444079464.

The spelling of 1391216128 in words is "one billion, three hundred ninety-one million, two hundred sixteen thousand, one hundred twenty-eight".