1396717785 has 12 divisors (see below), whose sum is σ = 2420977572. Its totient is φ = 744916128.

The previous prime is 1396717783. The next prime is 1396717799. The reversal of 1396717785 is 5877176931.

1396717785 is a `hidden beast` number, since 1 + 396 + 7 + 177 + 85 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1054430784 + 342287001 = 32472^2 + 18501^2 .

It is not a de Polignac number, because 1396717785 - 2¹ = 1396717783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1396717783) 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 11 ways as a sum of consecutive naturals, for example, 15519042 + ... + 15519131.

It is an arithmetic number, because the mean of its divisors is an integer number (201748131).

Almost surely, 2^1396717785 is an apocalyptic number.

1396717785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1396717785 is a deficient number, since it is larger than the sum of its proper divisors (1024259787).

1396717785 is a wasteful number, since it uses less digits than its factorization.

1396717785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31038184 (or 31038181 counting only the distinct ones).

The product of its digits is 2222640, while the sum is 54.

The square root of 1396717785 is about 37372.6876876684. The cubic root of 1396717785 is about 1117.8140252268.

It can be divided in two parts, 139671 and 7785, that added together give a square (147456 = 384²).

The spelling of 1396717785 in words is "one billion, three hundred ninety-six million, seven hundred seventeen thousand, seven hundred eighty-five".