1217512830 has 32 divisors (see below), whose sum is σ = 2932912800. Its totient is φ = 323460992.

The previous prime is 1217512819. The next prime is 1217512831. The reversal of 1217512830 is 382157121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217512831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67365 + ... + 83504.

It is an arithmetic number, because the mean of its divisors is an integer number (91653525).

Almost surely, 2^1217512830 is an apocalyptic number.

1217512830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1217512830 is an abundant number, since it is smaller than the sum of its proper divisors (1715399970).

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

1217512830 is a wasteful number, since it uses less digits than its factorization.

1217512830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151148.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 1217512830 is about 34892.8764936341. The cubic root of 1217512830 is about 1067.8031118068.

Adding to 1217512830 its reverse (382157121), we get a palindrome (1599669951).

The spelling of 1217512830 in words is "one billion, two hundred seventeen million, five hundred twelve thousand, eight hundred thirty".