1213685208 has 40 divisors (see below), whose sum is σ = 3399444180. Its totient is φ = 404561520.

The previous prime is 1213685197. The next prime is 1213685227. The reversal of 1213685208 is 8025863121.

It is a happy number.

1213685208 is a `hidden beast` number, since 121 + 3 + 6 + 8 + 520 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 935838 + ... + 937133.

Almost surely, 2^1213685208 is an apocalyptic number.

1213685208 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1213685208 is an abundant number, since it is smaller than the sum of its proper divisors (2185758972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213685208 is a wasteful number, since it uses less digits than its factorization.

1213685208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872989 (or 1872976 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1213685208 is about 34837.9851311754. The cubic root of 1213685208 is about 1066.6829491438.

It can be divided in two parts, 12136 and 85208, that added together give a square (97344 = 312²).

The spelling of 1213685208 in words is "one billion, two hundred thirteen million, six hundred eighty-five thousand, two hundred eight".