42304721 has 8 divisors (see below), whose sum is σ = 44892000. Its totient is φ = 39728448.

The previous prime is 42304709. The next prime is 42304729. The reversal of 42304721 is 12740324.

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 42304721 - 2⁶ = 42304657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42304729) 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, 5990 + ... + 10976.

It is an arithmetic number, because the mean of its divisors is an integer number (5611500).

Almost surely, 2^42304721 is an apocalyptic number.

It is an amenable number.

42304721 is a deficient number, since it is larger than the sum of its proper divisors (2587279).

42304721 is a wasteful number, since it uses less digits than its factorization.

42304721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5503.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 42304721 is about 6504.2079456303. The cubic root of 42304721 is about 348.4412890564.

The spelling of 42304721 in words is "forty-two million, three hundred four thousand, seven hundred twenty-one".