1216413 has 18 divisors (see below), whose sum is σ = 1933022. Its totient is φ = 736560.

The previous prime is 1216393. The next prime is 1216417. The reversal of 1216413 is 3146121.

It is a happy number.

1216413 is a `hidden beast` number, since 1 + 21 + 641 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 736164 + 480249 = 858^2 + 693^2 .

It is not a de Polignac number, because 1216413 - 2⁶ = 1216349 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216417) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 531 + ... + 1647.

2^1216413 is an apocalyptic number.

It is an amenable number.

1216413 is a deficient number, since it is larger than the sum of its proper divisors (716609).

1216413 is a wasteful number, since it uses less digits than its factorization.

1216413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145 (or 1131 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1216413 is about 1102.9111478265. The cubic root of 1216413 is about 106.7481484614.

The spelling of 1216413 in words is "one million, two hundred sixteen thousand, four hundred thirteen".