1261216 has 24 divisors (see below), whose sum is σ = 2709504. Its totient is φ = 573120.

The previous prime is 1261199. The next prime is 1261217. The reversal of 1261216 is 6121621.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1261193 and 1261202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261217) 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, 1440 + ... + 2143.

It is an arithmetic number, because the mean of its divisors is an integer number (112896).

2^1261216 is an apocalyptic number.

1261216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1261216 is an abundant number, since it is smaller than the sum of its proper divisors (1448288).

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

1261216 is a wasteful number, since it uses less digits than its factorization.

1261216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3604 (or 3596 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

The square root of 1261216 is about 1123.0387348618. The cubic root of 1261216 is about 108.0429641587.

Adding to 1261216 its reverse (6121621), we get a palindrome (7382837).

The spelling of 1261216 in words is "one million, two hundred sixty-one thousand, two hundred sixteen".