1391368905 has 48 divisors (see below), whose sum is σ = 2485776384. Its totient is φ = 719418240.

The previous prime is 1391368897. The next prime is 1391368919. The reversal of 1391368905 is 5098631931.

It is not a de Polignac number, because 1391368905 - 2³ = 1391368897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 516472 + ... + 519158.

It is an arithmetic number, because the mean of its divisors is an integer number (51787008).

Almost surely, 2^1391368905 is an apocalyptic number.

1391368905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1391368905 is a deficient number, since it is larger than the sum of its proper divisors (1094407479).

1391368905 is a wasteful number, since it uses less digits than its factorization.

1391368905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3046 (or 3043 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 1391368905 is about 37301.0576927786. The cubic root of 1391368905 is about 1116.3852703985.

The spelling of 1391368905 in words is "one billion, three hundred ninety-one million, three hundred sixty-eight thousand, nine hundred five".