42721500 has 96 divisors (see below), whose sum is σ = 131040000. Its totient is φ = 10785600.

The previous prime is 42721463. The next prime is 42721501. The reversal of 42721500 is 512724.

42721500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42721501) 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 31 ways as a sum of consecutive naturals, for example, 27751 + ... + 29249.

It is an arithmetic number, because the mean of its divisors is an integer number (1365000).

Almost surely, 2^42721500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42721500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65520000).

42721500 is an abundant number, since it is smaller than the sum of its proper divisors (88318500).

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

42721500 is a wasteful number, since it uses less digits than its factorization.

42721500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540 (or 1528 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 42721500 is about 6536.1686024765. The cubic root of 42721500 is about 349.5818134671.

The spelling of 42721500 in words is "forty-two million, seven hundred twenty-one thousand, five hundred".