1217042420 has 48 divisors (see below), whose sum is σ = 2884291200. Its totient is φ = 427297920.

The previous prime is 1217042419. The next prime is 1217042509. The reversal of 1217042420 is 242407121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89000 + ... + 101759.

It is an arithmetic number, because the mean of its divisors is an integer number (60089400).

Almost surely, 2^1217042420 is an apocalyptic number.

1217042420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1217042420 is an abundant number, since it is smaller than the sum of its proper divisors (1667248780).

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

1217042420 is a wasteful number, since it uses less digits than its factorization.

1217042420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190808 (or 190806 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 1217042420 is about 34886.1350682474. The cubic root of 1217042420 is about 1067.6655718551.

Adding to 1217042420 its reverse (242407121), we get a palindrome (1459449541).

The spelling of 1217042420 in words is "one billion, two hundred seventeen million, forty-two thousand, four hundred twenty".