8042743721 has 8 divisors (see below), whose sum is σ = 8242988544. Its totient is φ = 7842693280.

The previous prime is 8042743601. The next prime is 8042743733. The reversal of 8042743721 is 1273472408.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8042743721 - 2¹⁴ = 8042727337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8042743781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37040 + ... + 132126.

It is an arithmetic number, because the mean of its divisors is an integer number (1030373568).

Almost surely, 2^8042743721 is an apocalyptic number.

It is an amenable number.

8042743721 is a deficient number, since it is larger than the sum of its proper divisors (200244823).

8042743721 is a wasteful number, since it uses less digits than its factorization.

8042743721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97191.

The product of its (nonzero) digits is 75264, while the sum is 38.

The square root of 8042743721 is about 89681.3454459733. The cubic root of 8042743721 is about 2003.5556516745. Note that the first 3 decimals are identical.

The spelling of 8042743721 in words is "eight billion, forty-two million, seven hundred forty-three thousand, seven hundred twenty-one".