1220686 has 8 divisors (see below), whose sum is σ = 1849464. Its totient is φ = 604200.

The previous prime is 1220669. The next prime is 1220689. The reversal of 1220686 is 6860221.

1220686 = 56² + 57² + ... + 156².

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

It is a self number, because there is not a number n which added to its sum of digits gives 1220686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220689) 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, 2820 + ... + 3223.

It is an arithmetic number, because the mean of its divisors is an integer number (231183).

2^1220686 is an apocalyptic number.

1220686 is a deficient number, since it is larger than the sum of its proper divisors (628778).

1220686 is a wasteful number, since it uses less digits than its factorization.

1220686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6146.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1220686 is about 1104.8465956865. The cubic root of 1220686 is about 106.8729968960.

The spelling of 1220686 in words is "one million, two hundred twenty thousand, six hundred eighty-six".