1247720084 has 12 divisors (see below), whose sum is σ = 2351472564. Its totient is φ = 575870784.

The previous prime is 1247720081. The next prime is 1247720113. The reversal of 1247720084 is 4800277421.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 254083600 + 993636484 = 15940^2 + 31522^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247720081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11997257 + ... + 11997360.

It is an arithmetic number, because the mean of its divisors is an integer number (195956047).

Almost surely, 2^1247720084 is an apocalyptic number.

It is an amenable number.

1247720084 is a deficient number, since it is larger than the sum of its proper divisors (1103752480).

1247720084 is a wasteful number, since it uses less digits than its factorization.

1247720084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23994634 (or 23994632 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 35.

The square root of 1247720084 is about 35323.0814624093. The cubic root of 1247720084 is about 1076.5620224167.

The spelling of 1247720084 in words is "one billion, two hundred forty-seven million, seven hundred twenty thousand, eighty-four".