42551444 has 24 divisors (see below), whose sum is σ = 81167520. Its totient is φ = 19400544.

The previous prime is 42551441. The next prime is 42551447. The reversal of 42551444 is 44415524.

It is an interprime number because it is at equal distance from previous prime (42551441) and next prime (42551447).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 614 + ... + 9245.

It is an arithmetic number, because the mean of its divisors is an integer number (3381980).

Almost surely, 2^42551444 is an apocalyptic number.

It is an amenable number.

42551444 is a deficient number, since it is larger than the sum of its proper divisors (38616076).

42551444 is a wasteful number, since it uses less digits than its factorization.

42551444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9959 (or 9957 counting only the distinct ones).

The product of its digits is 12800, while the sum is 29.

The square root of 42551444 is about 6523.1467866360. The cubic root of 42551444 is about 349.1173514716.

Adding to 42551444 its reverse (44415524), we get a palindrome (86966968).

The spelling of 42551444 in words is "forty-two million, five hundred fifty-one thousand, four hundred forty-four".