1217993806 has 8 divisors (see below), whose sum is σ = 1871551584. Its totient is φ = 594143280.

The previous prime is 1217993801. The next prime is 1217993873. The reversal of 1217993806 is 6083997121.

It is a happy number.

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

It is a super-2 number, since 2×1217993806² = 2967017822908731272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217993801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7426710 + ... + 7426873.

It is an arithmetic number, because the mean of its divisors is an integer number (233943948).

Almost surely, 2^1217993806 is an apocalyptic number.

1217993806 is a deficient number, since it is larger than the sum of its proper divisors (653557778).

1217993806 is a wasteful number, since it uses less digits than its factorization.

1217993806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14853626.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 1217993806 is about 34899.7679934982. The cubic root of 1217993806 is about 1067.9437044536.

The spelling of 1217993806 in words is "one billion, two hundred seventeen million, nine hundred ninety-three thousand, eight hundred six".