1247888925 has 18 divisors (see below), whose sum is σ = 2235108122. Its totient is φ = 665540640.

The previous prime is 1247888923. The next prime is 1247888933. The reversal of 1247888925 is 5298887421.

1247888925 is a `hidden beast` number, since 1 + 2 + 478 + 88 + 92 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 185259321 + 1062629604 = 13611^2 + 32598^2 .

It is not a de Polignac number, because 1247888925 - 2¹ = 1247888923 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247888923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2772862 + ... + 2773311.

Almost surely, 2^1247888925 is an apocalyptic number.

1247888925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1247888925 is a deficient number, since it is larger than the sum of its proper divisors (987219197).

1247888925 is a wasteful number, since it uses less digits than its factorization.

1247888925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5546189 (or 5546181 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 54.

The square root of 1247888925 is about 35325.4713344352. The cubic root of 1247888925 is about 1076.6105802123.

The spelling of 1247888925 in words is "one billion, two hundred forty-seven million, eight hundred eighty-eight thousand, nine hundred twenty-five".