1247075740 has 12 divisors (see below), whose sum is σ = 2618859096. Its totient is φ = 498830288.

The previous prime is 1247075729. The next prime is 1247075741. The reversal of 1247075740 is 475707421.

It is a self number, because there is not a number n which added to its sum of digits gives 1247075740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247075741) 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, 31176874 + ... + 31176913.

It is an arithmetic number, because the mean of its divisors is an integer number (218238258).

Almost surely, 2^1247075740 is an apocalyptic number.

1247075740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1247075740 is an abundant number, since it is smaller than the sum of its proper divisors (1371783356).

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

1247075740 is a wasteful number, since it uses less digits than its factorization.

1247075740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62353796 (or 62353794 counting only the distinct ones).

The product of its (nonzero) digits is 54880, while the sum is 37.

The square root of 1247075740 is about 35313.9595627565. The cubic root of 1247075740 is about 1076.3766721576.

The spelling of 1247075740 in words is "one billion, two hundred forty-seven million, seventy-five thousand, seven hundred forty".