1220918 has 8 divisors (see below), whose sum is σ = 1841448. Its totient is φ = 607104.

The previous prime is 1220917. The next prime is 1220927. The reversal of 1220918 is 8190221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1220893 and 1220902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220917) 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, 1196 + ... + 1967.

It is an arithmetic number, because the mean of its divisors is an integer number (230181).

2^1220918 is an apocalyptic number.

1220918 is a deficient number, since it is larger than the sum of its proper divisors (620530).

1220918 is a wasteful number, since it uses less digits than its factorization.

1220918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3358.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1220918 is about 1104.9515826497. The cubic root of 1220918 is about 106.8797671232.

The spelling of 1220918 in words is "one million, two hundred twenty thousand, nine hundred eighteen".