1247120720 has 40 divisors (see below), whose sum is σ = 3025627776. Its totient is φ = 477158528.

The previous prime is 1247120713. The next prime is 1247120723. The reversal of 1247120720 is 270217421.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 1247120720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247120723) 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 7 ways as a sum of consecutive naturals, for example, 337052 + ... + 340731.

Almost surely, 2^1247120720 is an apocalyptic number.

1247120720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1247120720 is an abundant number, since it is smaller than the sum of its proper divisors (1778507056).

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

1247120720 is a wasteful number, since it uses less digits than its factorization.

1247120720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677819 (or 677813 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 1247120720 is about 35314.5964156466. The cubic root of 1247120720 is about 1076.3896130558.

The spelling of 1247120720 in words is "one billion, two hundred forty-seven million, one hundred twenty thousand, seven hundred twenty".