1217406906 has 36 divisors (see below), whose sum is σ = 2671772922. Its totient is φ = 400628592.

The previous prime is 1217406821. The next prime is 1217406913. The reversal of 1217406906 is 6096047121.

It can be written as a sum of positive squares in only one way, i.e., 1148599881 + 68807025 = 33891^2 + 8295^2 .

It is a super-3 number, since 3×1217406906³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 106920 + ... + 117756.

Almost surely, 2^1217406906 is an apocalyptic number.

1217406906 is an abundant number, since it is smaller than the sum of its proper divisors (1454366016).

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

1217406906 is a wasteful number, since it uses less digits than its factorization.

1217406906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11003 (or 10921 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 1217406906 is about 34891.3586149923. The cubic root of 1217406906 is about 1067.7721445063.

The spelling of 1217406906 in words is "one billion, two hundred seventeen million, four hundred six thousand, nine hundred six".