42520144 has 20 divisors (see below), whose sum is σ = 83235124. Its totient is φ = 21040128.

The previous prime is 42520139. The next prime is 42520183. The reversal of 42520144 is 44102524.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 24880144 + 17640000 = 4988^2 + 4200^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12147 + ... + 15250.

Almost surely, 2^42520144 is an apocalyptic number.

It is an amenable number.

42520144 is a deficient number, since it is larger than the sum of its proper divisors (40714980).

42520144 is a wasteful number, since it uses less digits than its factorization.

42520144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27502 (or 27496 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 42520144 is about 6520.7471964492. The cubic root of 42520144 is about 349.0317292028.

Adding to 42520144 its reverse (44102524), we get a palindrome (86622668).

The spelling of 42520144 in words is "forty-two million, five hundred twenty thousand, one hundred forty-four".