42551442 has 48 divisors (see below), whose sum is σ = 98192952. Its totient is φ = 13271040.

The previous prime is 42551441. The next prime is 42551447. The reversal of 42551442 is 24415524.

It can be written as a sum of positive squares in 4 ways, for example, as 40182921 + 2368521 = 6339^2 + 1539^2 .

It is not an unprimeable number, because it can be changed into a prime (42551441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73458 + ... + 74034.

Almost surely, 2^42551442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42551442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49096476).

42551442 is an abundant number, since it is smaller than the sum of its proper divisors (55641510).

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

42551442 is a wasteful number, since it uses less digits than its factorization.

42551442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843 (or 840 counting only the distinct ones).

The product of its digits is 6400, while the sum is 27.

The square root of 42551442 is about 6523.1466333358. The cubic root of 42551442 is about 349.1173460018.

Adding to 42551442 its reverse (24415524), we get a palindrome (66966966).

The spelling of 42551442 in words is "forty-two million, five hundred fifty-one thousand, four hundred forty-two".