1240817928 has 64 divisors (see below), whose sum is σ = 3579663360. Its totient is φ = 351072576.

The previous prime is 1240817923. The next prime is 1240817987. The reversal of 1240817928 is 8297180421.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 1240817928.

It is not an unprimeable number, because it can be changed into a prime (1240817923) 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 15 ways as a sum of consecutive naturals, for example, 18550 + ... + 53157.

It is an arithmetic number, because the mean of its divisors is an integer number (55932240).

Almost surely, 2^1240817928 is an apocalyptic number.

It is an amenable number.

1240817928 is an abundant number, since it is smaller than the sum of its proper divisors (2338845432).

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

1240817928 is a wasteful number, since it uses less digits than its factorization.

1240817928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71826 (or 71822 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 1240817928 is about 35225.2456059571. The cubic root of 1240817928 is about 1074.5732369119.

The spelling of 1240817928 in words is "one billion, two hundred forty million, eight hundred seventeen thousand, nine hundred twenty-eight".