1225216 has 20 divisors (see below), whose sum is σ = 2449062. Its totient is φ = 612352.

The previous prime is 1225183. The next prime is 1225219. The reversal of 1225216 is 6125221.

It can be written as a sum of positive squares in only one way, i.e., 1218816 + 6400 = 1104^2 + 80^2 .

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is a zygodrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 1225193 and 1225202.

It is not an unprimeable number, because it can be changed into a prime (1225219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 685 + ... + 1708.

2^1225216 is an apocalyptic number.

1225216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1225216 is a deficient number, since it is larger than the sum of its proper divisors (1223846).

1225216 is an frugal number, since it uses more digits than its factorization.

1225216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2411 (or 2395 counting only the distinct ones).

The product of its digits is 240, while the sum is 19.

The square root of 1225216 is about 1106.8947556114. The cubic root of 1225216 is about 107.0050365929.

It can be divided in two parts, 1225 and 216, that added together give a palindrome (1441).

The spelling of 1225216 in words is "one million, two hundred twenty-five thousand, two hundred sixteen".