1247602420 has 12 divisors (see below), whose sum is σ = 2619965124. Its totient is φ = 499040960.

The previous prime is 1247602397. The next prime is 1247602427. The reversal of 1247602420 is 242067421.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 727488784 + 520113636 = 26972^2 + 22806^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247602427) by changing a digit.

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, 31190041 + ... + 31190080.

It is an arithmetic number, because the mean of its divisors is an integer number (218330427).

Almost surely, 2^1247602420 is an apocalyptic number.

1247602420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1247602420 is an abundant number, since it is smaller than the sum of its proper divisors (1372362704).

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

1247602420 is a wasteful number, since it uses less digits than its factorization.

1247602420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62380130 (or 62380128 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 1247602420 is about 35321.4158832853. The cubic root of 1247602420 is about 1076.5281802707.

Adding to 1247602420 its reverse (242067421), we get a palindrome (1489669841).

The spelling of 1247602420 in words is "one billion, two hundred forty-seven million, six hundred two thousand, four hundred twenty".