1216420 has 12 divisors (see below), whose sum is σ = 2554524. Its totient is φ = 486560.

The previous prime is 1216417. The next prime is 1216421. The reversal of 1216420 is 246121.

It can be written as a sum of positive squares in 2 ways, for example, as 550564 + 665856 = 742^2 + 816^2 .

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 1216394 and 1216403.

It is not an unprimeable number, because it can be changed into a prime (1216421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30391 + ... + 30430.

It is an arithmetic number, because the mean of its divisors is an integer number (212877).

2^1216420 is an apocalyptic number.

1216420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216420 is an abundant number, since it is smaller than the sum of its proper divisors (1338104).

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

1216420 is a wasteful number, since it uses less digits than its factorization.

1216420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60830 (or 60828 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1216420 is about 1102.9143212417. The cubic root of 1216420 is about 106.7483532261.

Subtracting from 1216420 its reverse (246121), we obtain a cube (970299 = 99³).

The spelling of 1216420 in words is "one million, two hundred sixteen thousand, four hundred twenty".