742243521 has 8 divisors (see below), whose sum is σ = 989820000. Its totient is φ = 494748032.

The previous prime is 742243501. The next prime is 742243529. The reversal of 742243521 is 125342247.

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 742243521 - 2¹⁰ = 742242497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (742243529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6001 + ... + 38993.

It is an arithmetic number, because the mean of its divisors is an integer number (123727500).

Almost surely, 2^742243521 is an apocalyptic number.

It is an amenable number.

742243521 is a deficient number, since it is larger than the sum of its proper divisors (247576479).

742243521 is a wasteful number, since it uses less digits than its factorization.

742243521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40495.

The product of its digits is 13440, while the sum is 30.

The square root of 742243521 is about 27244.1465456343. The cubic root of 742243521 is about 905.4173348637.

Adding to 742243521 its reverse (125342247), we get a palindrome (867585768).

The spelling of 742243521 in words is "seven hundred forty-two million, two hundred forty-three thousand, five hundred twenty-one".