1216906 has 8 divisors (see below), whose sum is σ = 1834020. Its totient is φ = 605568.

The previous prime is 1216903. The next prime is 1216913. The reversal of 1216906 is 6096121.

It can be written as a sum of positive squares in 2 ways, for example, as 1083681 + 133225 = 1041^2 + 365^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1216903) 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, 871 + ... + 1786.

2^1216906 is an apocalyptic number.

1216906 is a deficient number, since it is larger than the sum of its proper divisors (617114).

1216906 is a wasteful number, since it uses less digits than its factorization.

1216906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2888.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1216906 is about 1103.1346246039. The cubic root of 1216906 is about 106.7625678318.

The spelling of 1216906 in words is "one million, two hundred sixteen thousand, nine hundred six".