1228985685 has 12 divisors (see below), whose sum is σ = 2130241932. Its totient is φ = 655459008.

The previous prime is 1228985663. The next prime is 1228985689. The reversal of 1228985685 is 5865898221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 910470276 + 318515409 = 30174^2 + 17847^2 .

It is not a de Polignac number, because 1228985685 - 2⁶ = 1228985621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228985689) 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, 13655352 + ... + 13655441.

It is an arithmetic number, because the mean of its divisors is an integer number (177520161).

Almost surely, 2^1228985685 is an apocalyptic number.

1228985685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1228985685 is a deficient number, since it is larger than the sum of its proper divisors (901256247).

1228985685 is a wasteful number, since it uses less digits than its factorization.

1228985685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27310804 (or 27310801 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 54.

The square root of 1228985685 is about 35056.8921183838. The cubic root of 1228985685 is about 1071.1466686543.

The spelling of 1228985685 in words is "one billion, two hundred twenty-eight million, nine hundred eighty-five thousand, six hundred eighty-five".