1397778485 has 4 divisors (see below), whose sum is σ = 1677334188. Its totient is φ = 1118222784.

The previous prime is 1397778469. The next prime is 1397778533. The reversal of 1397778485 is 5848777931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5848777931 = 67 ⋅87295193.

It can be written as a sum of positive squares in 2 ways, for example, as 401681764 + 996096721 = 20042^2 + 31561^2 .

It is a cyclic number.

It is not a de Polignac number, because 1397778485 - 2⁴ = 1397778469 is a prime.

It is a Duffinian number.

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 in 3 ways as a sum of consecutive naturals, for example, 139777844 + ... + 139777853.

It is an arithmetic number, because the mean of its divisors is an integer number (419333547).

Almost surely, 2^1397778485 is an apocalyptic number.

It is an amenable number.

1397778485 is a deficient number, since it is larger than the sum of its proper divisors (279555703).

1397778485 is an equidigital number, since it uses as much as digits as its factorization.

1397778485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279555702.

The product of its digits is 11854080, while the sum is 59.

The square root of 1397778485 is about 37386.8758389893. The cubic root of 1397778485 is about 1118.0969182912.

The spelling of 1397778485 in words is "one billion, three hundred ninety-seven million, seven hundred seventy-eight thousand, four hundred eighty-five".