42700721 has 8 divisors (see below), whose sum is σ = 49991424. Its totient is φ = 35707680.

The previous prime is 42700717. The next prime is 42700727. The reversal of 42700721 is 12700724.

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 42700721 - 2² = 42700717 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42700727) 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, 74105 + ... + 74678.

It is an arithmetic number, because the mean of its divisors is an integer number (6248928).

Almost surely, 2^42700721 is an apocalyptic number.

42700721 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

42700721 is a deficient number, since it is larger than the sum of its proper divisors (7290703).

42700721 is a wasteful number, since it uses less digits than its factorization.

42700721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148831.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 42700721 is about 6534.5788693687. The cubic root of 42700721 is about 349.5251274229.

The spelling of 42700721 in words is "forty-two million, seven hundred thousand, seven hundred twenty-one".