42143540 has 12 divisors (see below), whose sum is σ = 88501476. Its totient is φ = 16857408.

The previous prime is 42143513. The next prime is 42143573. The reversal of 42143540 is 4534124.

It can be written as a sum of positive squares in 2 ways, for example, as 9012004 + 33131536 = 3002^2 + 5756^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1053569 + ... + 1053608.

It is an arithmetic number, because the mean of its divisors is an integer number (7375123).

Almost surely, 2^42143540 is an apocalyptic number.

It is an amenable number.

42143540 is an abundant number, since it is smaller than the sum of its proper divisors (46357936).

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

42143540 is a wasteful number, since it uses less digits than its factorization.

42143540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2107186 (or 2107184 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 42143540 is about 6491.8056039903. The cubic root of 42143540 is about 347.9982053900.

Adding to 42143540 its reverse (4534124), we get a palindrome (46677664).

The spelling of 42143540 in words is "forty-two million, one hundred forty-three thousand, five hundred forty".