42721922 has 8 divisors (see below), whose sum is σ = 65292156. Its totient is φ = 20957872.

The previous prime is 42721891. The next prime is 42721927. The reversal of 42721922 is 22912724.

It can be written as a sum of positive squares in 2 ways, for example, as 37100281 + 5621641 = 6091^2 + 2371^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (42721927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201413 + ... + 201624.

Almost surely, 2^42721922 is an apocalyptic number.

42721922 is a deficient number, since it is larger than the sum of its proper divisors (22570234).

42721922 is a wasteful number, since it uses less digits than its factorization.

42721922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403092.

The product of its digits is 4032, while the sum is 29.

The square root of 42721922 is about 6536.2008843058. The cubic root of 42721922 is about 349.5829645116.

The spelling of 42721922 in words is "forty-two million, seven hundred twenty-one thousand, nine hundred twenty-two".