1245632420 has 12 divisors (see below), whose sum is σ = 2615828124. Its totient is φ = 498252960.

The previous prime is 1245632393. The next prime is 1245632431. The reversal of 1245632420 is 242365421.

It can be written as a sum of positive squares in 2 ways, for example, as 652904704 + 592727716 = 25552^2 + 24346^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31140791 + ... + 31140830.

It is an arithmetic number, because the mean of its divisors is an integer number (217985677).

Almost surely, 2^1245632420 is an apocalyptic number.

1245632420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245632420 is an abundant number, since it is smaller than the sum of its proper divisors (1370195704).

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

1245632420 is a wasteful number, since it uses less digits than its factorization.

1245632420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62281630 (or 62281628 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 1245632420 is about 35293.5181017705. The cubic root of 1245632420 is about 1075.9612588144.

Adding to 1245632420 its reverse (242365421), we get a palindrome (1487997841).

The spelling of 1245632420 in words is "one billion, two hundred forty-five million, six hundred thirty-two thousand, four hundred twenty".