1245665420 has 24 divisors (see below), whose sum is σ = 2706102000. Its totient is φ = 481084352.

The previous prime is 1245665401. The next prime is 1245665437. The reversal of 1245665420 is 245665421.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1073270 + ... + 1074429.

It is an arithmetic number, because the mean of its divisors is an integer number (112754250).

Almost surely, 2^1245665420 is an apocalyptic number.

1245665420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245665420 is an abundant number, since it is smaller than the sum of its proper divisors (1460436580).

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

1245665420 is a wasteful number, since it uses less digits than its factorization.

1245665420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2147737 (or 2147735 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 1245665420 is about 35293.9856066158. The cubic root of 1245665420 is about 1075.9707603889.

Subtracting from 1245665420 its reverse (245665421), we obtain a palindrome (999999999).

The spelling of 1245665420 in words is "one billion, two hundred forty-five million, six hundred sixty-five thousand, four hundred twenty".