1216620 has 60 divisors (see below), whose sum is σ = 3821664. Its totient is φ = 324000.

The previous prime is 1216619. The next prime is 1216681. The reversal of 1216620 is 266121.

It is a happy number.

1216620 is a `hidden beast` number, since 1 + 2 + 1 + 662 + 0 = 666.

1216620 is nontrivially palindromic in base 8.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1216593 and 1216602.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1245 + ... + 1995.

2^1216620 is an apocalyptic number.

1216620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1910832).

1216620 is an abundant number, since it is smaller than the sum of its proper divisors (2605044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216620 is a wasteful number, since it uses less digits than its factorization.

1216620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772 (or 761 counting only the distinct ones).

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

The square root of 1216620 is about 1103.0049863895. The cubic root of 1216620 is about 106.7542033165.

The spelling of 1216620 in words is "one million, two hundred sixteen thousand, six hundred twenty".