1217357142 has 16 divisors (see below), whose sum is σ = 2435188080. Its totient is φ = 405706752.

The previous prime is 1217357137. The next prime is 1217357143. The reversal of 1217357142 is 2417537121.

It is a super-2 number, since 2×1217357142² = 2963916822356816328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217357143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19734 + ... + 53142.

It is an arithmetic number, because the mean of its divisors is an integer number (152199255).

Almost surely, 2^1217357142 is an apocalyptic number.

1217357142 is an abundant number, since it is smaller than the sum of its proper divisors (1217830938).

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

1217357142 is a wasteful number, since it uses less digits than its factorization.

1217357142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39487.

The product of its digits is 11760, while the sum is 33.

The square root of 1217357142 is about 34890.6454798417. The cubic root of 1217357142 is about 1067.7575951838.

The spelling of 1217357142 in words is "one billion, two hundred seventeen million, three hundred fifty-seven thousand, one hundred forty-two".