42721206 has 32 divisors (see below), whose sum is σ = 94497408. Its totient is φ = 12767040.

The previous prime is 42721201. The next prime is 42721213. The reversal of 42721206 is 60212724.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42721201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385 + ... + 9251.

It is an arithmetic number, because the mean of its divisors is an integer number (2953044).

Almost surely, 2^42721206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42721206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47248704).

42721206 is an abundant number, since it is smaller than the sum of its proper divisors (51776202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42721206 is a wasteful number, since it uses less digits than its factorization.

42721206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8956.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 42721206 is about 6536.1461121979. The cubic root of 42721206 is about 349.5810115501.

The spelling of 42721206 in words is "forty-two million, seven hundred twenty-one thousand, two hundred six".