1245216420 has 108 divisors (see below), whose sum is σ = 4393866204. Its totient is φ = 284618880.

The previous prime is 1245216419. The next prime is 1245216437. The reversal of 1245216420 is 246125421.

1245216420 is a `hidden beast` number, since 1 + 24 + 5 + 216 + 420 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 738426276 + 506790144 = 27174^2 + 22512^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 61771 + ... + 79410.

Almost surely, 2^1245216420 is an apocalyptic number.

1245216420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245216420 is an abundant number, since it is smaller than the sum of its proper divisors (3148649784).

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

1245216420 is a wasteful number, since it uses less digits than its factorization.

1245216420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141210 (or 141198 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 1245216420 is about 35287.6241761896. The cubic root of 1245216420 is about 1075.8414669952.

Subtracting from 1245216420 its reverse (246125421), we obtain a palindrome (999090999).

The spelling of 1245216420 in words is "one billion, two hundred forty-five million, two hundred sixteen thousand, four hundred twenty".