1213684 has 6 divisors (see below), whose sum is σ = 2123954. Its totient is φ = 606840.

The previous prime is 1213673. The next prime is 1213721. The reversal of 1213684 is 4863121.

It can be written as a sum of positive squares in only one way, i.e., 608400 + 605284 = 780^2 + 778^2 .

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151707 + ... + 151714.

2^1213684 is an apocalyptic number.

It is an amenable number.

1213684 is a deficient number, since it is larger than the sum of its proper divisors (910270).

1213684 is a wasteful number, since it uses less digits than its factorization.

1213684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303425 (or 303423 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 1213684 is about 1101.6732727992. The cubic root of 1213684 is about 106.6682595248.

The spelling of 1213684 in words is "one million, two hundred thirteen thousand, six hundred eighty-four".