1216664 has 8 divisors (see below), whose sum is σ = 2281260. Its totient is φ = 608328.
The previous prime is 1216619. The next prime is 1216681. The reversal of 1216664 is 4666121.
It is a happy number.
It is a tau number, because it is divible by the number of its divisors (8).
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76034 + ... + 76049.
21216664 is an apocalyptic number.
It is an amenable number.
1216664 is a deficient number, since it is larger than the sum of its proper divisors (1064596).
1216664 is a wasteful number, since it uses less digits than its factorization.
1216664 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 152089 (or 152085 counting only the distinct ones).
The product of its digits is 1728, while the sum is 26.
The square root of 1216664 is about 1103.0249317219. The cubic root of 1216664 is about 106.7554902503.
The spelling of 1216664 in words is "one million, two hundred sixteen thousand, six hundred sixty-four".
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