42451530 has 64 divisors (see below), whose sum is σ = 111881088. Its totient is φ = 10223360.

The previous prime is 42451511. The next prime is 42451531. The reversal of 42451530 is 3515424.

It is a self number, because there is not a number n which added to its sum of digits gives 42451530.

It is not an unprimeable number, because it can be changed into a prime (42451531) 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 31 ways as a sum of consecutive naturals, for example, 64684 + ... + 65336.

It is an arithmetic number, because the mean of its divisors is an integer number (1748142).

Almost surely, 2^42451530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42451530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55940544).

42451530 is an abundant number, since it is smaller than the sum of its proper divisors (69429558).

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

42451530 is a wasteful number, since it uses less digits than its factorization.

42451530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 42451530 is about 6515.4838653779. The cubic root of 42451530 is about 348.8438860293.

Adding to 42451530 its reverse (3515424), we get a palindrome (45966954).

It can be divided in two parts, 4245 and 1530, that added together give a palindrome (5775).

The spelling of 42451530 in words is "forty-two million, four hundred fifty-one thousand, five hundred thirty".