1213688 has 16 divisors (see below), whose sum is σ = 2600880. Its totient is φ = 520128.

The previous prime is 1213673. The next prime is 1213721. The reversal of 1213688 is 8863121.

It is a super-2 number, since 2×1213688² = 2946077122688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1213688.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10781 + ... + 10892.

It is an arithmetic number, because the mean of its divisors is an integer number (162555).

2^1213688 is an apocalyptic number.

It is an amenable number.

1213688 is an abundant number, since it is smaller than the sum of its proper divisors (1387192).

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

1213688 is a wasteful number, since it uses less digits than its factorization.

1213688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21686 (or 21682 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 1213688 is about 1101.6750882179. The cubic root of 1213688 is about 106.6683767087.

The spelling of 1213688 in words is "one million, two hundred thirteen thousand, six hundred eighty-eight".