1215668 has 6 divisors (see below), whose sum is σ = 2127426. Its totient is φ = 607832.

The previous prime is 1215649. The next prime is 1215673. The reversal of 1215668 is 8665121.

It is a happy number.

1215668 is nontrivially palindromic in base 9.

It can be written as a sum of positive squares in only one way, i.e., 1170724 + 44944 = 1082^2 + 212^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1215668.

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, 151955 + ... + 151962.

It is an arithmetic number, because the mean of its divisors is an integer number (354571).

2^1215668 is an apocalyptic number.

It is an amenable number.

1215668 is a deficient number, since it is larger than the sum of its proper divisors (911758).

1215668 is a wasteful number, since it uses less digits than its factorization.

1215668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303921 (or 303919 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 1215668 is about 1102.5733535688. The cubic root of 1215668 is about 106.7263511464.

The spelling of 1215668 in words is "one million, two hundred fifteen thousand, six hundred sixty-eight".