1216393 has 2 divisors, whose sum is σ = 1216394. Its totient is φ = 1216392.

The previous prime is 1216387. The next prime is 1216417. The reversal of 1216393 is 3936121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1108809 + 107584 = 1053^2 + 328^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216393 - 2⁹ = 1215881 is a prime.

It is a super-2 number, since 2×1216393² = 2959223860898, which contains 22 as substring.

It is equal to p₉₄₀₈₄ and since 1216393 and 94084 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1216373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608196 + 608197.

It is an arithmetic number, because the mean of its divisors is an integer number (608197).

2^1216393 is an apocalyptic number.

It is an amenable number.

1216393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216393 is an equidigital number, since it uses as much as digits as its factorization.

1216393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 25.

The square root of 1216393 is about 1102.9020808757. The cubic root of 1216393 is about 106.7475634148.

The spelling of 1216393 in words is "one million, two hundred sixteen thousand, three hundred ninety-three".