1155216 has 40 divisors (see below), whose sum is σ = 3062304. Its totient is φ = 375040.

The previous prime is 1155211. The next prime is 1155223. The reversal of 1155216 is 6125511.

It is a junction number, because it is equal to n+sod(n) for n = 1155192 and 1155201.

It is not an unprimeable number, because it can be changed into a prime (1155211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1675 + ... + 2261.

2^1155216 is an apocalyptic number.

1155216 is a gapful number since it is divisible by the number (16) 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 1155216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1531152).

1155216 is an abundant number, since it is smaller than the sum of its proper divisors (1907088).

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

1155216 is a wasteful number, since it uses less digits than its factorization.

1155216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639 (or 633 counting only the distinct ones).

The product of its digits is 300, while the sum is 21.

The square root of 1155216 is about 1074.8097506071. The cubic root of 1155216 is about 104.9271149519.

The spelling of 1155216 in words is "one million, one hundred fifty-five thousand, two hundred sixteen".