1247711040 has 280 divisors, whose sum is σ = 4561786152. Its totient is φ = 323481600.

The previous prime is 1247711027. The next prime is 1247711041. The reversal of 1247711040 is 401177421.

It can be written as a sum of positive squares in 4 ways, for example, as 38340864 + 1209370176 = 6192^2 + 34776^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1247710995 and 1247711013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247711041) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 958390 + ... + 959690.

Almost surely, 2^1247711040 is an apocalyptic number.

1247711040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1247711040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2280893076).

1247711040 is an abundant number, since it is smaller than the sum of its proper divisors (3314075112).

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

1247711040 is a wasteful number, since it uses less digits than its factorization.

1247711040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1367 (or 1348 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 1247711040 is about 35322.9534439010. The cubic root of 1247711040 is about 1076.5594212857.

Adding to 1247711040 its reverse (401177421), we get a palindrome (1648888461).

The spelling of 1247711040 in words is "one billion, two hundred forty-seven million, seven hundred eleven thousand, forty".