1216690430 has 8 divisors (see below), whose sum is σ = 2190042792. Its totient is φ = 486676168.

The previous prime is 1216690399. The next prime is 1216690439. The reversal of 1216690430 is 340966121.

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

It is a super-3 number, since 3×1216690430³ (a number of 28 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216690439) 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, 60834512 + ... + 60834531.

It is an arithmetic number, because the mean of its divisors is an integer number (273755349).

Almost surely, 2^1216690430 is an apocalyptic number.

1216690430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216690430 is a deficient number, since it is larger than the sum of its proper divisors (973352362).

1216690430 is a wasteful number, since it uses less digits than its factorization.

1216690430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121669050.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 1216690430 is about 34881.0898625602. The cubic root of 1216690430 is about 1067.5626327315.

The spelling of 1216690430 in words is "one billion, two hundred sixteen million, six hundred ninety thousand, four hundred thirty".