1247315520 has 224 divisors, whose sum is σ = 4470318720. Its totient is φ = 291880960.

The previous prime is 1247315479. The next prime is 1247315557. The reversal of 1247315520 is 255137421.

It is a super-3 number, since 3×1247315520³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 304204 + ... + 308276.

It is an arithmetic number, because the mean of its divisors is an integer number (19956780).

Almost surely, 2^1247315520 is an apocalyptic number.

1247315520 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 1247315520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2235159360).

1247315520 is an abundant number, since it is smaller than the sum of its proper divisors (3223003200).

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

1247315520 is a wasteful number, since it uses less digits than its factorization.

1247315520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4133 (or 4123 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 1247315520 is about 35317.3543743016. The cubic root of 1247315520 is about 1076.4456540834.

The spelling of 1247315520 in words is "one billion, two hundred forty-seven million, three hundred fifteen thousand, five hundred twenty".