42850721 has 4 divisors (see below), whose sum is σ = 43490352. Its totient is φ = 42211092.

The previous prime is 42850673. The next prime is 42850751. The reversal of 42850721 is 12705824.

42850721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42850721 - 2⁶ = 42850657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42850751) 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 3 ways as a sum of consecutive naturals, for example, 319715 + ... + 319848.

It is an arithmetic number, because the mean of its divisors is an integer number (10872588).

Almost surely, 2^42850721 is an apocalyptic number.

It is an amenable number.

42850721 is a deficient number, since it is larger than the sum of its proper divisors (639631).

42850721 is an equidigital number, since it uses as much as digits as its factorization.

42850721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639630.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 42850721 is about 6546.0462112637. The cubic root of 42850721 is about 349.9339222196.

The spelling of 42850721 in words is "forty-two million, eight hundred fifty thousand, seven hundred twenty-one".